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:     Would you like a cigarette ?  
 Person2:  No , thanks . I've decided to give up smoking .  
 Person1:      Really ? Why ?  
 Person2:  Well , it's just that I think if you don't enjoy doing something any more , you should stop doing it .  
 Person1:      I see . You mean you don't enjoy smoking any more ?  
 Person2:  That's right . You should give it up , too . It's bad for your health .  
 Person1:      Stop talking like my mother . That's what she keeps saying .  
 Person2:  But it's true . It's a nasty habit . I can't think why I ever started . Anyway , it's obviously got you in its grip !  
 Person1:      What do you mean ? What are you talking about ?  
 Person2:  I mean you couldn't give it up !  
 Person1:      Who ? Me ? Could't give up smoking ? Nonsense ! Of course I could ! I know I could !  
 Person2:  How do you know ?  
 Person1:      Because I've already proved it . Smoking's the easiest thing in the world to give up . I've done it hundreds of times ! 

1