# Event-Aware Convai Characters
## Use of Invoke Speech function
Our goal in this example is to have the character welcome the player whenever the player enters a certain area, this can be done by using the `Invoke Speech` node that basically invokes the AI character to talk and a simple collision box.
1. Open your AI character blueprint and select the `Viewport` tab.\
Note: the character blueprint can be a MetaHuman, ReadyPlayerMe, Reallusion or even a custom one you have created, just ensure that it has the `Convai Chatbot` component.
2. From the `Components` list add a `Box Collision`.
Add box collision to your Convai Character
3. Switch back to the `Event Graph` tab.
4. Select the `Box Collision` you just added and scroll down in the `Details panel`. Under `Events` add the `On Component Begin Overlap` event to your event graph.
Add On Component Begin Overlap event to EventGraph
6. Setup the following blueprint schematic which uses the `Invoke Speech` node from the `Convai Chatbot` component.
Invoke Speech function from Convai Chatbot component
7. Enter a `Trigger Message` that expresses what happened (i.e. "Player Approached") and you can add a simple instruction (i.e. Greet the player).
8. Setting the `In Generate Actions` and `In Voice Response` boolean to true will let the Convai Characters perform actions and generate audio responses respectively.
9. Hit `Compile` and `Save` then run the program.
10. On approaching a certain vicinity will trigger the event and the Convai Character will greet the character as mentioned in the Trigger Message.
{% hint style="success" %}
The above example is just a simple use case. However, the use of Invoke Speech opens new doors to limitless use cases.
{% endhint %}
