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 interested in those things .  
 Person1:        But they ’ re 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 ’ re very fashionable , you see .  
 Person2:I ’ m afraid I ’ m not interested in fashion .  
 Person1:        I see .  
 Person2:But thank you very much all the same .  
 Person1:        Sorry , I couldn ’ t help you . 

formal