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:     Have you seen Harry ?  
 Person2:  No . As far as I can remember he was supposed to be on a business trip to Lisbon .  
 Person1:      Yes , but he was supposed to be back by now .  
 Person2:  Maybe you'll call his home . 

1