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:  I want to buy a hat . 
 Person1:      Come here , please . 
 Person2:  Is this one fit for you ? It is nice . 
 Person1:      I don't like the style . 
 Person2:  How about this one ? 
 Person1:      Black is not my favorite colour . 
 Person2:  You must like this pink one , don't you ? 
 Person1:      It's pretty . How much is it ? 
 Person2:  Fifty yuan . 
 Person1:      It's too expensive . Can you come down a little ? 
 Person2:  How about forty-five ? 
 Person1:      I'll buy it if forty . 
 Person2:  OK . 

1