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:       This is my admission card , and these are the books .  
 Person2:OK , a moment , please .  
 Person1:        By the way , can I renew the borrowing ?  
 Person2:For which one ?  
 Person1:        Sense and Sensibility , English version .  
 Person2:Yes , of course .  
 Person1:        Can I just do it here ?  
 Person2:Sorry . No . You should go to the other counter .  
 Person1:        OK , thanks .  
 Person2:Sorry , this biography is over the deadline . You should pay extra for it .  
 Person1:        I was thinking of buying this from the bookstore when my father got this from the library ... anyway , how much should I pay ?  
 Person2:3 Yuan , please .  
 Person1:        Here you are . Thanks .  
 Person2:You are welcome . See you next time . 

formal