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:     Who ’ s this ? your girl-friend ?  
 Person2:  No , it ’ s my sister .  
 Person1:      How old is she ?  
 Person2:  She ’ s 18 .  
 Person1:      She is tall ?  
 Person2:  Yes , she is .  
 Person1:      And she is thin , isn ’ t she ?  
 Person2:  Well , just a little thin . 

1