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:       Would you like to see our new shirts ? 
 Person2:Sorry , but I ’ m not really that interested in those things . 
 Person1:        Well , they are very nice you know . 
 Person2:Really ? 
 Person1:        And not expensive either . 
 Person2:Oh , I don't care about that . 
 Person1:        Everybody is buying them . 
 Person2:Are they ? 
 Person1:        Yes , they are very fashionable , you see . 
 Person2:I am afraid I am not interested in fashion . 
 Person1:        I see . 
 Person2:But thank you very much all the same . 
 Person1:        Sorry I couldn't help you . 

formal