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:       It depends on where you are and what position you are in . For instance , if you are in an elevator and you smile , you will make other takers uncomfortable .  
 Person2:That ’ s an exception . But I am fed up with those who keep a straight face in front of me .  
 Person1:        I cannot see eye to eye with you here . You see , I am fed up with those who keep smiling to me . I mean , they smile for no reason at all .  
 Person2:That means you don ’ t like them . If you hit it off with them , you will like to see their smiles . 

informal