Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. If the conversation begins with a question, label it '1' otherwise '0'.
Input:  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 . 

1