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:       What can I do for you ? 
 Person2:I want to check out these books . 
 Person1:        I need your library card . 
 Person2:I have it right here . 
 Person1:        It seems you have late fees . 
 Person2:Are you sure ? 
 Person1:        Yes , I ’ m sure . 
 Person2:How much ? 
 Person1:        Your late fees come to $ 24.50 . 
 Person2:I don ’ t have that right now . 
 Person1:        You have to pay it off before you can check out more books . 
 Person2:I ’ ll do that soon . 

formal