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:       Welcome to our university ’ s fifties anniversary , Sir . Please have a seat .  
 Person2:Thank you . Wow , your school has so many honors . Congratulations !  
 Person1:        Thank you .  
 Person2:Excuse me . I wonder see Dean Mr . Lee first . I was wondering if could you tell me where his office is ?  
 Person1:        Certainly . Mr . Lee ’ s office building at the south end of the campus , just beside the library .  
 Person2:Excuse me ?  
 Person1:        Let me show you the way . Please follow me .  
 Person2:Thank you very much . It ’ s very kind of you .  
 Person1:        My pleasure .  
 Person2:This is it ?  
 Person1:        It ’ s up on the second floor . You have to use the stairs . The elevator isn ’ t working . 

informal