What is the main topic of the conversation?

M: When is the guest speaker for tomorrow’s investment seminar scheduled to arrive?
W: His flight should land at 7A.M., and he should be at the convention center at 8:30.
M: His presentation is scheduled for 9 o’clock, so that will be enough time for him to do any last-minute preparations. It might be a good idea to order some breakfast for him, though.
W: I agree. He might not have a chance to eat before he gets here. I can contact the cafeteria at the convention center and ask them to prepare something for him.