How does Linda know that Lee is at the city?

W: Hello? I would like to speak to Mr. Lee.
M: This is Lee speaking.
W: This is Linda, your old friend.
M: Oh, how are you, Linda? I’m glad you called.
W: Mr. Smith wrote to me that you were coming to our city. May I see you at your hotel?
M: Please hold on a moment. I have to check my schedule. Yes, that’s all right.
W: Great. I’ll be there in half an hour.
M: All right, I’ll be expecting you.
W: Oh, I almost forgot. What’s your room number?
M: It’s the No. 311 on the second floor. Please call me if you can’t find me.
W: I’ll do that. See you later.