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:     How may I help you ?  
 Person2:  I would like to return an item .  
 Person1:      What are you returning ?  
 Person2:  I want to return this cellphone .  
 Person1:      Is there a problem ?  
 Person2:  It's broken .  
 Person1:      What exactly is wrong with it ?  
 Person2:  The phone turns off by itself .  
 Person1:      That's fine , but do you have your receipt with you ?  
 Person2:  Yes , here it is .  
 Person1:      I'll refund your money right now .  
 Person2:  Thank you so much . 

1