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:     I want some envelopes please .  
 Person2:  Do you want the large size , or the small size ?  
 Person1:      The large size please . Do Have you any writing-paper ?  
 Person2:  Yes , we do . I don't have any small pads . I only have large ones . Do you want a pad ?  
 Person1:      Yes , please . And I want some glue .  
 Person2:  A bottle of glue .  
 Person1:      And I want a large box of chalk , too .  
 Person2:  I only have small boxes . Do you want one ?  
 Person1:      No , thank you .  
 Person2:  Is that all ?  
 Person1:      That's all , thank you .  
 Person2:  What else do you want ?  
 Person1:      I want my change . 

0