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:       Did you hear peter just retired ?  
 Person2:Are you sure ? He is quite young , isn't he ?  
 Person1:        He is not young as he looks . I think he's almost sixty .  
 Person2:Really ? He looks so young . 

informal