What does the woman do?

M: Excuse me, ma’am.
W: Yes. May I help you?
M: I’m a graduate student here m mathematics. I’ve just come from China and I’ve never used a Western library before. I’ll be here for five years, so I’d like to learn how to use the library as efficiently as possible. I wonder if someone ’might have time to show me around.
W: I’d be very glad to show you around, but I’m very busy right now. Could you come back about 3:30?
M: Sure. 3:30 this afternoon.
W: Good. See you later.
M: Thank you. Good-bye.