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:     Mr . Lee , I was wondering if you and your wife had plans for next Friday night ?  
 Person2:  Yes , I think we might be free . What did you have in mind ?  
 Person1:      I've mailed a formal written invitation to your home inviting you to a dinner party at my home .  
 Person2:  That sounds great . Is it casual ?  
 Person1:      Actually , we thought it would be fun to have a formal sit-down dinner for the holidays .  
 Person2:  That sounds good . It will give my wife a chance to dress up .  
 Person1:      Yes , we've invited four other couples , so it should be a good mix of people .  
 Person2:  That sounds wonderful . Will there be anyone there that I know ?  
 Person1:      Oh yes , everyone we are inviting is from our company .  
 Person2:  Great ! I'll look forward to it . We'll make sure and check the mail for our invitation . 

1