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:     Hi , Celia ! How was your trip to the United States ?  
 Person2:  It was terrific . I really enjoyed it .  
 Person1:      Great . How long were you away ?  
 Person2:  I was there for about three weeks .  
 Person1:      That's a long time ! Was the weather OK ?  
 Person2:  Yes , most of the time . But it snowed a lot in Chicago .  
 Person1:      So , what was the best thing about your trip ?  
 Person2:  Oh , that's difficult to say . But I guess I liked Nashville the best . 

1