Why doesn’t the woman take the last plane in the evening?

W: Could you tell me the time of the last plane to New York this evening?
M: There’s one at 9:20, but it’s fully booked, I think.
W: Then the time of the first plane tomorrow morning?
M: The first plane leaves at 7:30.
W: Can you tell me when it arrives so that I can ask my secretary to come and meet me?
M: It arrives at 10:30, but maybe a little late because of the bad weather.
W: Well, I wonder if you’d let me know if there’s any change on that flight, I’d appreciate it.
M: Yes, of course. What’s your room number?
W: 609. Thank you.