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:     Hey , Bob . Are you getting the feeling you've been here before ?  
 Person2:  Yes , I'm sure I've been here before .  
 Person1:      Maybe we're walking in circles .  
 Person2:  Yes , there's that bar we passed an hour ago . 

1