Where is Mrs. Smith most probably?

M: Please hold the line, Mrs. Smith. The doctor will talk to you in a minute.
W: I’m afraid I may have to hang up. I don’t have any more coins and the line will be cut soon.

M: You’re going to make a trip to San Francisco, aren’t you?
W: Yes. But I haven’t got the plane ticket yet. I’m thinking of postponing the trip to next month since this is the busiest month for the airlines.