What are the speakers mainly discussing?

M Hi, Diane, do you still want to go to see that play this Saturday?
W Oh, I would really like to but I’m afraid I can’t. My friend is visiting me from Ottawa. We are going to go to the movies on Saturday night. Would you like to join us?
M Yeah, that would be good. Have you already reserved the tickets?
W Not yet, I’ll do that now. I want to make sure they aren’t sold out before we go.