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 didn't expect to see you at this hour . You must have goofed off again .  
 Person2:Goofed off ? Maybe , but I'm not a clock-watcher . I finished doing what I should do and then knock off an hour earlier .  
 Person1:        You'll be sorry if the boss finds it out . He may probably give you the bag .  
 Person2:I'm sure of what I'm doing . 

formal