Amy: May, are you free tomorrow?
May: Yes. Why?
Amy: I just want to make sure whether you want to go shopping with me or not?
May: I'd like to. But I have nothing to buy.
Amy: That's great! When shall we meet?
May: I think we should get up early and meet in the morning.
Amy: Why should we do that?
May: Because it will be very crowded in the afternoon.