A、Booking a theatre ticket. B、Reserving a room. C、Booking an air ticket. D、Reserving a seat. C问题问的是对话讨论的主题是什么。根据男士所说Will you boo

M: Good morning. Will you book a plane ticket to London for me?
W: Yes, sir. What time would you like to leave?
M: The 21st of December.
W: There are several flights available.
M: Morning flights will be perfect.
W: Yes，sir. There is a flight available on that day, at 10:00 am.
M: Fine. I’ll take that flight, then.
Q15: What does the conversation talk about?
Q16: What’s the relationship between the two speakers?