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:       Please forgive me for rushing into your room forgetting to knock at the door .  
 Person2:Never mind .  
 Person1:        I'm so sorry to disturb you so early .  
 Person2:It doesn't matter .  
 Person1:        I'm dreadfully sorry . I forgot to book the tickets yesterday .  
 Person2:Oh , it's nothing .  
 Person1:        I let you down . I'll make it up to you somehow .  
 Person2:Not a bit of it , don't blame yourself . 

informal