system
A chat on subreddit /r/me_irl
human
Playing It Straight is a show that got *very* close to this premise
gpt
That must be the reality show I was think of.... aired in late 90s or earlier 2000s?  

I can't remember which network tried it, and I'm not sure it lasted more than one season, if that.

The advent of reality TV had some pretty questionable content lol.