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:       Who did the stupid thing ? 
 Person2:It must be Kate . 
 Person1:        No , I don't think you're right.Kate never does things like that.It must be a naughty boy who did it . 

formal