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:     What can I do for you ? 
 Person2:  I want to get a package of cigarette . 
 Person1:      Have you a taste for this kind ? 
 Person2:  No , this kind of cigarette is too strong for me , I desire a mild one . 
 Person1:      What about this ? 
 Person2:  It suits my taste , I'll take it . Do you have lighters ? 
 Person1:      I have a lot of them . 
 Person2:  Show me the one made of plastic . 
 Person1:      OK , here you are . 
 Person2:  Thank you . 

1