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:     Can I help you , sir ?  
 Person2:  I wish to buy a diamond ring .  
 Person1:      How many carats would you like it to be ?  
 Person2:  I want five carats .  
 Person1:      Is this one suitable for you ?  
 Person2:  No , it seems too old-fashioned to my fiancee .  
 Person1:      What about this ?  
 Person2:  It seems too small for me , haven't you got any larger ones ?  
 Person1:      Then you can buy this one . It's very nice and latest in style .  
 Person2:  Oh , this one is perfect . 

1