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:     Do you know that song ?  
 Person2:  Which song ?  
 Person1:      The song you hear now .  
 Person2:  No , I've never heard of this song before . It's beautiful ! Who sing it ?  
 Person1:      Elvis Presley . Don't you recognize his voice ?  
 Person2:  No . How about going to karaoke tonight ?  
 Person1:      Good idea . 

1