Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
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 . 

informal