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:     Is that girl your girlfriend ? 
 Person2:  No , it's not . 
 Person1:      She doesn't look like our classmate . 
 Person2:  Don't mistake her as somebody . She ' s my older sister . 
 Person1:      Really , she's so pretty . 

1