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 do you need ?  
 Person2:I would like to check out a book .  
 Person1:        I ’ m going to need your library card .  
 Person2:I don ’ t have a library card .  
 Person1:        Why don ’ t you apply for one right now ?  
 Person2:Sure . That would be great .  
 Person1:        Please fill out this application .  
 Person2:Okay . Here you go .  
 Person1:        Now , sign your name on the back of the card .  
 Person2:Here you go .  
 Person1:        Here ’ s your library card .  
 Person2:Thanks . Now I ’ d like to check out this book . 

formal