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:     Hello ? 
 Person2:  Hi , David . You are very difficult to reach . I called several times . But I kept getting a busy signal . Is your phone out of order ? 
 Person1:      No , not out of order . But we seem to have a bad connection on the phone line . I can ’ t hear you clearly . 
 Person2:  Ok . Let me call you later . Is that okay ? 
 Person1:      Sure . Thanks . 

1