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:     Have you ever witnessed any crimes or accidents ?  
 Person2:  I don't quite remember . Why did you ask that ?  
 Person1:      I was taking a walk in the park early this morning when suddenly I heard someone calling " help " . I rushed over and saw a man beating a woman .  
 Person2:  Oh , my . What did you do ?  
 Person1:      I guess I was stunned for a moment , then I quickly ran away to get help .  
 Person2:  Did you call the police ?  
 Person1:      Yes . Fortunately , I had my cell with me this morning . I called the police as I was running to get people to come to help . 

1