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:       The Johnson are on their way back . You remember them , don't you ?  
 Person2:Johnson ? I can't place them .  
 Person1:        We met them in Bermuda last May .  
 Person2:They've completely slipped my mind .  
 Person1:        The couple with the dogs-think back .  
 Person2:No , I don't recall a thing about them .  
 Person1:        Well , I've invited them for brunch .  
 Person2:Hmm , I must be getting absent-minded . 

formal