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:       Good morning . I ’ m from the new york book review . Could I ask you some question about your latest book ?  
 Person2:Sure . Take a seat ... what would you like to know ?  
 Person1:        First , I ’ Ve heard that your latest book is based on a true story .  
 Person2:That ’ s correct . It ’ s a murder mystery based on actual murders that book place in florida several years ago . The main character-the police invesigator-is based on the man who investigated the case .  
 Person1:        How do you research your books ?  
 Person2:I always visit the places that I use as setting for stories . Readers like things to be as factually correct as possible-even in fiction ! I usually base my characters on people I have met . Most charact  
 Person1:        I really like your books . I ’ Ve just finished this one . I read it from cover to cover in a single day . Congratulation on making the bestseller list yet again !  
 Person2:Thank you . Let met sign it for you ... there you go .  
 Person1:        Oh ! Thank you very much . I heard that you are currently writing a collection of short stories . What are the stories about ?  
 Person2:There ’ s a real mix of stories in the book . I haven ’ t finished all of them yet , though . Many of them are short detective stories , but there are also horror stories and sci-fi ones . If you give me your  
 Person1:        Thanks very much . I ’ m sure it will sell well . I can ’ t wait to read it . Here ’ s my card . Thank you for you time . 

informal