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:     What ’ s the matter , Sally ? You look so unhappy .  
 Person2:  I had a bad day yesterday .  
 Person1:      What happened ?  
 Person2:  I went to the library and lost my bag .  
 Person1:      Your bag ? Did you get it back ?  
 Person2:  I went back for it . But it was already gone .  
 Person1:      That ’ s too bad . I ’ m sorry to hear that . 

1