answer: Zhang Lin and Lin Tao greet each other.
documents: #Person1#: Hello, Zhang lin! Fancy meeting you here!
  #Person2#: Hi, Lin Tao. I have't seen you for some time.
  #Person1#: How's life going, Zhang Lin?
  #Person2#: Yes, the same as ever, thanks. What about you?
  #Person1#: Pretty good, thanks. I'm going to see my uncle.
  #Person2#: Good bye then, and keep in touch.
  #Person1#: Good bye.