No chatting allowed then, I guess. 
Back in 2013 and for a couple years after, the youtube gamers started making videos with Eviebot and boibot. The top youtuber and gamer PewDiePie made his own bot, PewDiebot.
Here’s Eviebot. Hasn’t change much since then as far as I can tell.
Here’s a site where you can create your own chatbot. I haven’t looked at it carefully or tried it out, but it looks interesting.