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:     Are you free this evening , Li ? 
 Person2:  I ’ m afraid I ’ m busy tonight . I ’ m having dinner with friends . 
 Person1:      What a pity . I wanted to go for a drink with you . 
 Person2:  What about tomorrow ? Are you doing anything tomorrow ? 
 Person1:      No , I haven ’ t got any plans . 
 Person2:  Shall we go out tomorrow then ? 
 Person1:      Why not ? Sounds good to me . 

1