单项选择题

[听力原文]9-10
M: Good morning. Will you book a plane ticket to Lon don for me
W: Yes, sir. What time would you like to leave
M: Next Tuesday, if possible.
W: That’ Il be the 21st of December.
M: Yes, that’s right.
W: There are several flights available.
M: Would you check what flights are available on the 21st of December
W: All right. Let me check it over.
M: Morning flights will be perfect.
W: Yes, sir. There is a flight available on that day, at 10:00 a. m.
M: Fine. I’ll take that flight, then.
W: 10:00 a.m. I’ll fix your ticket.
M: When do I check in
W: You must be there by 9:00 a. m.
M: Thank you.

What’ s the relationship between the two speakers（）

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