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:       Aren ’ t you going to swim ? 
 Person2:Are you kidding ? Don't you know I can't swim ? 
 Person1:        You are not telling me that we drove 50 miles to come here for just sunbath , are you ? 
 Person2:Hey , don't shout . Come here ! Sit closer . Now , Jim , we ’ Ve had a lovely day . Don't spoil it now . 
 Person1:        What about your beautiful bathing suit ? We shopped all day . Don't you want to show it off ? 
 Person2:Everybody who walks past me sees it . Besides , it's a good sunbathing suit . 
 Person1:        All right . Suit yourself . I am going swimming . 
 Person2:Jim ! 
 Person1:        Yes ? 
 Person2:Can you get me a beach umbrella and a deck chair ? I am really tired of lying in thousand . 
 Person1:        I've got a better idea . Why don ’ t we hire a boat and go for a ride ? What do you think ? 
 Person2:Are you serious ? That will be wonderful ! 

informal