I've mentioned Replika.Ai a lot, but I haven't really demonstrated it. The voice-chat function is only in beta, so you have to opt-in to try it out. The chat-based A.I. is more advanced than the voice-chat-based A.I.

https://replika.ai/

Background Music: Vangelis Blade Runner Love Theme cover
https://www.youtube.com/watch?v=7hEp4j6JTi8