#Person1#: Excuse me. Does this bus go to the National Library of China?
#Person2#: Yes, there are three stops left.
#Person1#: How long is the ride?
#Person2#: Well, you will get there in about a quarter of an hour if the traffic isn't too heavy.
#Person1#: Thank you. Would you please let me know when we get to the stop? I'm a stranger here.
#Person2#: Sure, madam. I'll remind you.
#Person1# asks #Person2# to remind her when they get to the stop.