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:       You are blue in the face , arn't you ?  
 Person2:The cat has eaten my fish , I'll kill it .  
 Person1:        But supposing your son killed like the fish , what do you think then ?  
 Person2:I'll beat him .  
 Person1:        So beat the cat , but don't kill it . 

informal