dialogue: Louise: Excuse me. Does this bus go to the National Library of China?
  Grayce: Yes, there are three stops left.
  Louise: How long is the ride?
  Grayce: Well, you will get there in about a quarter of an hour if the traffic isn't too heavy.
  Louise: Thank you. Would you please let me know when we get to the stop? I'm a stranger here.
  Grayce: Sure, madam. I'll remind you.
summary: Louise asks Grayce to remind her when they get to the stop.