# Events

Conversations in Rasa are represented as a sequence of events. This page lists the event types defined in Rasa Core.

**Note**  
If you are using the Rasa SDK to write custom actions in python, you need to import the events from `rasa_sdk.events`, not from `rasa.core.events`. If you are writing actions in another language, your events should be formatted like the JSON objects on this page.

## General Purpose Events

### Set a Slot

**Short**  
Event to set a slot on a tracker

**JSON**  
```json
{
    "event": "slot",
    "name": "departure_airport",
    "value": "BER"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker._set_slot(self.key, self.value)
```

### Restart a conversation

**Short**  
Resets anything logged on the tracker.

**JSON**  
```json
{
    "event": "restart"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    from rasa.core.actions.action import (  # pytype: disable=pyi-error
        ACTION_LISTEN_NAME,
    )

tracker._reset()
    tracker.trigger_followup_action(ACTION_LISTEN_NAME)
```

### Reset all Slots

**Short**  
Resets all the slots of a conversation.

**JSON**  
```json
{
    "event": "reset_slots"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker) -> None:
    tracker._reset_slots()
```

### Schedule a reminder

**Short**  
Schedule an intent to be triggered in the future.

**JSON**  
```json
{
    "event": "reminder",
    "intent": "my_intent",
    "entities": {"entity1": "value1", "entity2": "value2"},
    "date_time": "2018-09-03T11:41:10.128172",
    "name": "my_reminder",
    "kill_on_user_msg": true
}
```  
**Effect**  
When added to a tracker, Rasa Core will schedule the intent (and entities) to be triggered in the future, in place of a user input.

### Cancel a reminder

**Short**  
Cancel one or more reminders.

**JSON**  
```json
{
    "event": "cancel_reminder",
    "name": "my_reminder",
    "intent": "my_intent",
    "entities": [
        {"entity": "entity1", "value": "value1"},
        {"entity": "entity2", "value": "value2"}
    ],
    "date_time": "2018-09-03T11:41:10.128172"
}
```  
**Effect**  
When added to a tracker, Rasa Core will cancel any outstanding reminders that match the `ReminderCancelled` event.

### Pause a conversation

**Short**  
Stops the bot from responding to messages.

**JSON**  
```json
{
    "event": "pause"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker) -> None:
    tracker._paused = True
```

### Resume a conversation

**Short**  
Resumes a previously paused conversation.

**JSON**  
```json
{
    "event": "resume"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker) -> None:
    tracker._paused = False
```

### Force a followup action

**Short**  
Instead of predicting the next action, force the next action to be a fixed one.

**JSON**  
```json
{
    "event": "followup",
    "name": "my_action"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker.trigger_followup_action(self.action_name)
```

## Automatically tracked events

### User sent message

**Short**  
Message a user sent to the bot.

**JSON**  
```json
{
    "event": "user",
    "text": "Hey",
    "parse_data": {
        "intent": {
            "name": "greet",
            "confidence": 0.9
        },
        "entities": []
    },
    "metadata": {}
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker.latest_message = self
    tracker.clear_followup_action()
```

### Bot responded message

**Short**  
Message a bot sent to the user.

**JSON**  
```json
{
    "event": "bot",
    "text": "Hey there!",
    "data": {}
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker.latest_bot_utterance = self
```

### Undo a user message

**Short**  
Undoes all side effects that happened after the last user message.

**JSON**  
```json
{
    "event": "rewind"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker._reset()
    tracker.replay_events()
```

### Undo an action

**Short**  
Undoes all side effects that happened after the last action.

**JSON**  
```json
{
    "event": "undo"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker._reset()
    tracker.replay_events()
```

### Log an executed action

**Short**  
Logs an action the bot executed to the conversation.

**JSON**  
```json
{
    "event": "action",
    "name": "my_action"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker.set_latest_action_name(self.action_name)
    tracker.clear_followup_action()
```

### Start a new conversation session

**Short**  
Marks the beginning of a new conversation session.

**JSON**  
```json
{
    "event": "session_started"
}
```  
**Effect**  
When added to a tracker, this is the code used to update the tracker:

```python
def apply_to(self, tracker: "DialogueStateTracker") -> None:
    tracker._reset()
```

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