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 teacher criticise Myra in front of the whole class ?  
 Person2:Because Myra was cheating on exams , and she spoke back rudely .  
 Person1:        I don't think that Myra should have spoken so rudely to the teacher . I know she was angry , but that's still no excuse for rudeness . 

formal