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:       How may I help you ?  
 Person2:I need to return these books .  
 Person1:        Give them here .  
 Person2:Here they are .  
 Person1:        It appears these books are two weeks late .  
 Person2:I forgot they were due .  
 Person1:        You do realize you are going to have to pay late fees , right ?  
 Person2:How much is the late fee ?  
 Person1:        The late fee is 25 cents a day .  
 Person2:So I have to pay 25 cents for each day the books are late ?  
 Person1:        It ’ s 25 cents for each book .  
 Person2:That ’ s a lot of money . 

informal