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 doing , awake ? 
 Person2:I can't sleep ... 
 Person1:        But it's almost midnight ! 
 Person2:Exactly . I'm too excited for Christmas morning . Also , I thought I heard Santa . 
 Person1:        Really ? How do you know it was Santa ? 
 Person2:Well , I heard that naughty boys and girls get coal in their stockings , so I thought I'd be nice and make Santa cookies . I even left out some milk . I heard someone in the kitchen eating the cookies , so I came downstairs ! 
 Person1:        Hmm ... well I know that Santa won't come down the chimney with you hiding behind the tree , spying on him ! 
 Person2:Really ? 
 Person1:        Really ! Let's go back upstairs and get back to bed . That way , we can let Santa do his job . Then when you wake up , it will be Christmas already ! 
 Person2:O-K ... 
 Person1:        Hey , honey ! Is that you ? Don't eat all the cookies — I want some , too ! 

formal