answer: Lily won the Chinese contest and will go to China free of charge. David congratulates her.
documents: #Person1#: David, I'm going to China. 
  #Person2#: Really? How do you get the chance? 
  #Person1#: You know. I took part in the Chinese contest. I was the best and they gave me this reward. I don't have to pay for my trip. 
  #Person2#: Congratulations. How lucky you are! 
  #Person1#: Thank you. I'm leaving tomorrow morning. 
  #Person2#: I'm sure you'll enjoy the trip. China is such a beautiful country. 
  #Person1#: I'm sure I will. 
  #Person2#: Have a nice journey, Lily. 
  #Person1#: Thank you, David.