What is the probable relationship between the man and the woman?

W: Bill, could you tell me where the University Shuttle Bus stop is?
M: Well, it depends on the bus. Both the Family Housing Bus and the Recreation Centre Bus stop in front of the bookstore, but the bus to the Music Complex stops around the corner.
W: Oh. How can I tell which one is the Recreation Centre Bus?
M: It has the letters "RC" above the windshield. All the buses have the initials of their final destination posted there.
W: Do you know the schedules?
M: For the "RC’bus, about every twenty minutes during the day, but after five o’clock, it runs every hour until midnight.
W: Is it usually on time?
M: Yes, except during rush hour.
W: So I should go now if I’m going to catch it?
M: Not quite so soon. Look, I have to catch the Family Housing Bus. The Recreation Centre Bus should come before mine. We can go together and I’ll let you know which one to get on.
W: Oh, thank you.
M: Not at all.