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:     Where were you last night , at exactly nine twenty PM ?  
 Person2:  nine twenty pm , I couldn't say . I cann't remember .  
 Person1:      Are you sure you cann't remember ?  
 Person2:  I've absolutely certain .  
 Person1:      Were you in or out ? Can you remember that ?  
 Person2:  I'm not quite positive . I think I went out at about half pass nine .  
 Person1:      Did you see anyone come into the block flats ?  
 Person2:  No , I didn't .  
 Person1:      Sure ?  
 Person2:  Quite sure . 

1