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 , is this seat taken ?  
 Person2:  Er ... no , go ahead .  
 Person1:      You work upstair , right ? I think I have seen you before . I'm Karren , Karren Brown .  
 Person2:  Nice to meet you , Karren . I'm Tim Wang .  
 Person1:      Happy to know you , Tim . 

1