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 are you watching on the telly ? 
 Person2:there's a great sitcom on Channel 3 that stars in about three minutes . 
 Person1:        which one is that ? 
 Person2:the office . Have you watched it ? 
 Person1:        I've seen the British version and loved it , but have never seen the American version . 
 Person2:it's almost exactly the same . I think it's a hilarious show . 
 Person1:        what are you watching now ? 
 Person2:they're just showing highlights of American Idol from last night right now . 
 Person1:        I can't stand American Idol ! I think it's really over-rated . 
 Person2:I couldn't agree with you more . 
 Person1:        have you got satellite , cable , or digital TV ? 
 Person2:we have digital TV . It's amazing though---even with 100 channels , there's often nothing on that I'd want to watch ! 
 Person1:        do you watch a lot of TV then ? 
 Person2:I guess so . I'm bit of a couch potato . How about you ? 
 Person1:        I don't have a TV at home , so I rarely watch anything . Is there anything worth watching after the office ? 
 Person2:there's actually a documentary on the history channel later on that I'd like to watch . Do you want to stay and watch it with me ? 
 Person1:        why not ? I don't have anything better to do ! 

formal