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:       Mrs . Montgomery ? I ’ Ve been trying to figure out when we should have the New Year ’ s party . Could you take a book at these dates ?  
 Person2:Sure . The twenty-ninth is out . I ’ ll be out of the office all day at a seminar . Either the twenty-eighth or the thirtieth is fine .  
 Person1:        Well , why don ’ t we make it the thirtieth ? We can set it up from three to five . That way , everybody can just go home afterwards .  
 Person2:Sounds good to me . You make up the invitations , I ’ Ve got run . I ’ Ve got a meeting in five minutes . 

informal