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:     Did you say you saw lily alone ?  
 Person2:  Yes , nobody was with her .  
 Person1:      Where did you say she was ?  
 Person2:  In Thailand .  
 Person1:      I must say I think that is very odd . Are you absolutely certain it was her ?  
 Person2:  Yes . yes , I am sure .  
 Person1:      Because I don't want any , er , do you understand ? But you are quite sure , are you ?  
 Person2:  Quite sure . I mean that hair of hers and the voice of hers . 

1