Excuse me, Miss.
Yes. May I help you?
I'm a graduate student here in 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 to use the library as efficiently as possible. I wonder if someone might have time to show me around.
I'd be very glad to show you around, but I'm very busy right now. Could you come back about 3 thirty?
Sure. 3 thirty this afternoon.
Good. See you later.