answer: Lili phones Mr. Smith to tell him she's returning to China today and expresses her gratitude for the dinner and his help.
documents: #Person1#: How do you do, Mr. Smith ? This is Lili. I'm calling to thank you for the wonderful dinner we had yesterday . I enjoyed it very much. 
  #Person2#: You're welcome. I'd like you to join us for dinner again sometime. 
  #Person1#: Thank you, Mr. Smith. I'm returning to China today. 
  #Person2#: Today? 
  #Person1#: Yes. I appreciate all help and in particular, all the time that you've spent on my account during my stay here. 
  #Person2#: Don't mention it. I am pleased to help you. 
  #Person1#: If there's anything that I can help you in the future, please let me know. 
  #Person2#: I'll do that. Thank you. Have a safe trip home.