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:       By the way , how many books am I allowed to check out ?  
 Person2:You can check out two books at a time .  
 Person1:        How long can I keep the books ?  
 Person2:For two weeks . After that you must renew the books if you wish to keep them longer . 

formal