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:       Professor Wang looks so handsome today . He is wearing a light brown suit and a pink tie . 
 Person2:He always wears an extremely becoming suit with tie . 
 Person1:        He ’ s quite particular about what he wears , especially about his ties . He gets different tie each day . 
 Person2:A light brown suit and a pink tie today , and a light blue shirt and a blue tie yesterday . A perfect match ! 
 Person1:        The tie is necessary for man . It makes you look so attractive in a super tie . 
 Person2:Match is important ; well , the way of tying is also important . 
 Person1:        My father dose not know how to tie a tie , for he often wears a cravat . 
 Person2:My father wears a tie every day , but he can ’ t do it himself . My mother helps him with his tie every morning . 
 Person1:        You mother is not only a patient mother but also a gentle wife . 

informal