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:     So how long have you known Mary ?  
 Person2:  Only four days .  
 Person1:      Only four days ! That's so short , and you seem so crazy about her .  
 Person2:  I know . I can't help thinking about her . She's always on my mind . 

1