On the problem of distinguishing a bot from a human, I suggest the following podcast episode from Cautionary Tales [1]. I found it both enjoyable and interesting, as it shows an interesting point of view about the matter: if we already had bots that passed as humans long ago, is because
we are often bad at conversations, not necessarily because the bot is extremely good at it (and indeed in most cases it isn't).
[1] https://podcasts.google.com/feed/aHR0cHM6Ly93d3cub21ueWNvbnR...