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:     Have you heard about Alice and David ?  
 Person2:  No , have they had another fight ?  
 Person1:      No , they've got engaged .  
 Person2:  You must be joking . Those two ?  
 Person1:      Well , my dear , I didn't believe it either . But I got it straight from the horse's mouth . David called me this morning .  
 Person2:  So when did this all happen ?  
 Person1:      Last weekend , while they were on their ski trip .  
 Person2:  Well , I believe it now , and when are they are getting married ?  
 Person1:      Next June .  
 Person2:  I can hardly believe it . 

1