ChatGPT was asked to do the following: "Write a dialogue between two characters showing one character failing to accept the burden of proof."

Here is what ChatGPT generated:

Alice: Hey, Mark, have you heard about the new theory on time travel?

Mark: Yeah, I've heard about it$.$ But I$\text{'}$m not convinced it's possible.

Alice: Why not? The theory has some solid mathematical backing.

Mark: Well, I just don't buy it$.$ Time travel seems like something out of science fiction, not real life.

Alice: But the math supports it$.$ And there have been experiments showing potential feasibility.

Mark: Look, I don't have to prove it's impossible. You're the one claiming it's possible, so the burden of proof is on you.

Alice: But that's not how it works. Extraordinary claims require evidence. And the burden of proof should be shared.

Mark: I disagree. Until you can provide concrete evidence, I$\text{'}$m not going to entertain the idea of time travel.

Alice: But without considering the evidence, how can you come to any conclusion?

Mark: I'll stick to what's scientifically proven. Time travel just seems too far$-$fetched for me$.$

In your short answer response, say which of the characters has a greater burden of proof and why. Both individuals have a burden of proof. Does one of the characters actually fail to accept the burden of proof? Which one and why?