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

M: Is this your umbrella, Miss?
W: Oh yes, it is. Thank you. I was looking for it just now.
M: You look a bit familiar to me. I wonder if I have seen you somewhere before.
W: Have you?
M: May I ask where you live?
W: Just two blocks away, in that tall building.
M: That’s it. I live there, too. I live on the sixth floor.
W: My family moved in just two weeks ago. We live on the fourth floor.
M: It’s a small world! May I know your name, Miss?
W: I’m Chen Ying.
M: How do you do. Miss Chen? I’m Song Wei.
W: I’m glad to know you, Mr. Song.
M: Are you going to your office now, Miss Chen?
W: No. I’m going to do some shopping for the weekend. What a bout you?
M: I’m going to the airport to meet some friends from Beijing.
W: See you later, Mr. Song.
M: Have a good day, Miss Chen.
W: You too.