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 think that ’ s settled .  
 Person2:I'm tired of your cut-and-dried opinions . Who do you think you are !  
 Person1:        How dare you speak to me like this .  
 Person2:Why not ? 

informal