Professor at Cornell, Gordon Pennycock, conducted a study where participants chatted with a custom ChatGPT bot, which tried to debunk their conspiracy beliefs. You can read about it at the site https://debunkbot.com.
I heard about it in an interview with the Question Everything podcast. Great interview and interesting results. Long story short, within three messages, a bot can sway a conspiracy believer (using facts) 25% of the time.