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:       Wasn't that a great flick ? I was on the edge of my seat through the whole movie . 
 Person2:I would say it was a typical run-of-the-mill Hollywood thriller . 
 Person1:        Well , I'm no movie expert , but those special effects were impressive by any standards . 
 Person2:Special effects ? Baloney ! That movie was made on a shoestring budget . They've been using trick photography like that for years 
 Person1:        Okay . But you have to admit that it was an exciting story , especially with that surprise ending . 
 Person2:You should read the book . The original story is much better and has a different twist at the end . 
 Person1:        Oh , really ? How does the book end ? 
 Person2:Read it yourself and find out ! 

informal