Talking mouth with Rasa

I’m looking for examples or maybe even a working github or something. We are wanting to make a simple robot with a single servo for the mouth and wanted to see how hard this would be using RASA. The idea would be one could chat with the robot and even train it.
I think these days no one really wants to use Alexa or Google due to privacy.
I know there was the Alice Chatbot and it would be cool to have something like as a starter into Rasa that you could then add a servo to or something like that and chat with it.

Ok maybe a servo would be to hard. Then what about a animated mouth talking.

Just thinking out loud here. Thoughts? Helps?