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:     Excuse me ...  
 Person2:  Yes , sir . How may I be of service ?  
 Person1:      I would like to return this item ... Are refunds allowed ?  
 Person2:  Certainly . The customer is always right , we are here to serve you . Is there a reason that you would like to return it ? Did you have problems with our product or services ?  
 Person1:      No , no ... It was just the wrong size .  
 Person2:  Would you be interested in an exchange as opposed to a refund ? I think I can help you to find the appropriate size .  
 Person1:      No . I would rather just return it .  
 Person2:  Sure , no problem . Do you happen to have the receipt ?  
 Person1:      Yeah , right here .  
 Person2:  Ok , just a moment , please . Here you are , I need you to sign here , please . And here is your refund . Is there anything else I can help you with ?  
 Person1:      No , thank you .  
 Person2:  You're welcome . Have a nice day ! 

0