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:     Mark , you are not telling me the truth . Now why ?  
 Person2:  Promise you are not going to be angry ?  
 Person1:      Yes , all right . So why ? Go on then . Say it . Oh , really , Mark . I promise I'm not going to be angry . Now why were you late ?  
 Person2:  I forgot .  
 Person1:      You forgot ? You ...  
 Person2:  Ah , ah , you promised , and remember ? 

1