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:       I really need a new pair of trousers .  
 Person2:Do you ?  
 Person1:        Yes , I do . This one is very old now .  
 Person2:They look all right to me .  
 Person1:        They ’ re not all right . They ’ re uncomfortable and they look terrible .  
 Person2:All right . All right . 

formal