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:       Don't you have too much to do with him .  
 Person2:Why not ?  
 Person1:        His father is a prisoner .  
 Person2:So what ? His father is in prison , not he . 

informal