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:       May I help you ?  
 Person2:I would like to check out these books .  
 Person1:        May I see your library card , please ?  
 Person2:Yes . Here you go .  
 Person1:        Apparently , you have unpaid late fees .  
 Person2:I do ?  
 Person1:        You owe some money .  
 Person2:Exactly how much do I owe ?  
 Person1:        You owe $ 24.50 .  
 Person2:I won ’ t be able to pay that right now .  
 Person1:        Until you pay it , you can ’ t check out books .  
 Person2:I will pay it . Don ’ t worry . 

formal