answer: Song Mei finds Chen Ming's umbrella and they find out they are neighbors. Then they exchange their name.
documents: #Person1#: Is this your umbrella, miss?
  #Person2#: Oh, yes, it is. Thank you. I was looking for it just now.
  #Person1#: You look a bit familiar to me. I wonder if I have seen you somewhere before.
  #Person2#: Have you?
  #Person1#: May I ask where you live?
  #Person2#: Just two blocks away, in that tall building.
  #Person1#: That's it. I live there, too. I live on the sixth floor.
  #Person2#: My family move in just two weeks ago. We live on the fourth floor.
  #Person1#: It's a small world! May I know your name, miss?
  #Person2#: I'm Chen Ming.
  #Person1#: How do you do, Miss Chen? I'm Song Mei.
  #Person2#: I'm glad to meet you, Mr. Song.
  #Person1#: Are you going to your office now, Miss Chen?
  #Person2#: No, I'm going to the airport to meet some friends from Beijing.