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:     Hello , do you remember me ? I bought some vases from you yesterday .  
 Person2:  eyes , you sent them to New York , right ?  
 Person1:      That's right . I thought I'd come back to buy a few more souvenirs .  
 Person2:  What did you have in mind ?  
 Person1:      Well , first , I'd like to buy a few postcards . My sister used to always send a postcard to herself whenever she went anywhere . I want to do that , too .  
 Person2:  We have plenty of postcards to choose from here . The same designs can be found on these posters .  
 Person1:      Posters are difficult to travel with . I think I'll just buy the postcards . I heard that you might also have some of the masks that are made in Venice .  
 Person2:  Yes , we do . They're on the wall behind you .  
 Person1:      How much do they cost ?  
 Person2:  The prices are clearly marked on the back of each mask . Would you like me to get one down for you to look at ?  
 Person1:      Yes , I think I'd like the green mask in the middle .  
 Person2:  Here you go .  
 Person1:      I'll take it , I'd also like to buy some chocolate .  
 Person2:  Are you looking for some homemade chocolate as a gift ?  
 Person1:      Yes , it's my girlfriend's birthday today and she loves chocolate .  
 Person2:  We've got plenty to choose from here .  
 Person1:      They look delicious . I think she'll be pleased . 

1