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:     Can I help you ? 
 Person2:  Yes , I want to buy a suit . 
 Person1:      What about the red one ? It's the best seller . 
 Person2:  Yeah , it's quite cute . I don't think it will fit me . I would prefer a darker color . Have you a black one ? 
 Person1:      Yes , We have . 

1