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:       Why did the boss come down on Joe like a ton of bricks .  
 Person2:He spoke evil behind his back .  
 Person1:        How did he know that he had bad mouthed him ?  
 Person2:Someone told Joe off .  
 Person1:        He is then in a very difficult situation .  
 Person2:Sure . He ’ ll get the bag , I think . 

formal