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:     Alice , I never knew you had such a lovely voice . You really can sing , can't you ?  
 Person2:  Thanks , Mark . I used to be a member of the school choir .  
 Person1:      No wonder you can control your voice so well . You are a professional singer .  
 Person2:  Well , you are flattering me . I wouldn't say I am a professional , but I did receive some training at school . My music teacher used to be a professional singer .  
 Person1:      Well , a good teacher makes good students .  
 Person2:  You are quite right . 

1