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: Consider Input: Person1: I always think everybody looks down on me
Person2:Don't be that negative .
Person1: How can you be optimistic ? You can see it in their eyes .
Person2:I find it there is no meaning in living this world .
Person1: Don't be that negative .
Person2:Really , life is so boring .

Output: formal

Input: Consider Input: Person1: What's your favorite hobby ?
Person2:I'd like reading books best .
Person1: What kinds of books do you like to read ?
Person2:Literature and economy .
Person1: By the way , would you like to see movies ?
Person2:That's OK .
Person1: What do you do in your spare time ?
Person2:I like to play golf , play badminton or crack jokes .
Person1: I just like to sleep like a lazy cat .
Person2:That's a bad habit .

Output: formal

Input: Consider Input: Person1: I suppose you like cinematography and costumes and that sort of stuff ?
Person2:Yes , I do . The look of a picture is very important .
Person1: I think sound is even more important ! Guns , bombs , sirens--that's what makes a movie exciting !
Person2:You wouldn't know a good movie even if it bit you on the nose .
Person1: In my book , all a good movie needs is a chase scene and lots of things that blow up .
Person2:Enough ! If we don't finish the game , there won't be time for any movies tonight !
Output: formal