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:       How's your brother doing ? 
 Person2:As a matter of fact , he hasn't been feeling too well . 
 Person1:        I'm sorry to hear that . What's the matter ? 
 Person2:Tell him I hope he's better soon . 
 Person1:        I'll tell him . Thanks for asking about him . 

informal