answer: Mr. Lin calls to tell Mr.Green he won't be to see off Mr.Green himself tomorrow at the airport. They express their gratitude and appreciation and say goodbye to each other on the phone.
documents: #Person1#: Hello, Mr. Green. This is Lin Tong. How are you?
  #Person2#: Hi, Mr. Lin. I am leaving tomorrow and I am just packing.
  #Person1#: Oh, sorry to interrupt you. But I am calling to say goodbye to you. I am awfully sorry to tell you that I am afraid I could not see you off at the airport tomorrow, because I will have to attend a very important meeting.
  #Person2#: It doesn't matter, Mr. Lin. I can understand. I know you are always very busy. Work must come first.
  #Person1#: Thanks a lot. You have been here for almost three weeks. How time flies!
  #Person2#: Yes. And I would like to convey my thanks to you for your help during my stay here in Nanjing.
  #Person1#: It is our pleasure. It has been a great pleasure to work with you.
  #Person2#: Me too. I am looking forward to cooperating with you again.
  #Person1#: Really? Great! We will. Well, what's your flight number? When are you leaving tomorrow?
  #Person2#: It's Flight No. 104, Northey Airlines, which leaves at ten O'dock tomorrow evening.
  #Person1#: OK, I will send someone to see you off.
  #Person2#: That is so thoughtful of you.
  #Person1#: My pleasure. Take care and have a nice trip.
  #Person2#: Thanks a lot. My wife and I will be welcoming and looking forward to your visit.
  #Person1#: Let's call it a deal. Hope to see you again soon. Keep in touch then. Byebye.
  #Person2#: Goodbye. Thanks again.