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:       Have you run into your cousin Jimmy lately ? 
 Person2:As a matter of fact , I have . I ran into him just the other day . 
 Person1:        How's he doing ? 
 Person2:Not too well . He had to have four teeth pulled last week . 
 Person1:        He did ? That's too bad ! 
 Person2:I think so , too . 
 Person1:        Next time you see him , please tell him I'm thinking of him . 
 Person2:I'll be sure to do that . 

informal