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:       Hi , why do you look so depressed today , Mike ?  
 Person2:I had a terrible quarrel with my neighbor yesterday .  
 Person1:        How come ?  
 Person2:It is a long story . Basically , she thought I had laughed at her while I didn't .  
 Person1:        I know everyone suffers when he is misunderstood . But why not take it easy ?  
 Person2:Yeah . It's so nice of you to comfort me . 

informal