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:     Well , I've never downloaded music before . How does it work ?  
 Person2:  You haven't ? If you've never tried it I can show you how .  
 Person1:      Alright . But why is downloading music better than buying Cds at the store ?  
 Person2:  Downloading music is really fast and convenient , and you can preview all the songs before you buy them . 

1