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:       I met Mark yesterday . He looked blue .  
 Person2:He ’ s been on the gravy train these years , hasn ’ t he ?  
 Person1:        It belongs to the past . He lost his job the other day , and he ’ s up a tree now .  
 Person2:It seems that nobody can always expect things to pan out well each time . 

formal