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'.
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Question: Person1: OK , Hello !
Person2:Hello !
Person1: Hi , what's your name ?
Person2:Yeah , my name is Nandu .
Person1: Nandu . Nandu , how do you spell you name ?
Person2:Yeah , my name is like N-A-N-J-U .
Person1: Oh , OK . That's a nice name , Nandu . And where are you from ?
Person2:I'm from Madras .

Answer: formal

Question: Person1: Congratulations , Vivian . You won the grand prize , again .
Person2:Isn't it just great ! I just knew I'd win !
Person1: You did ? How ? Did you wear red underwear again this year ?
Person2:Not only that !
Person1: Tell me ! Tell me ! What's your secret ? !
Person2:OK , OK . I'll whisper it to you , but you have to promise not to tell anyone !
Person1: What ? ! You did that ? ? ! ! !

Answer: informal

Question: Person1: Who is your favorite NBA star ?
Person2:Kobe Bryant , of course .
Person1: Kobe ? I know him , the key guy of the Lakers , a heck of a NBA player . He is on fire when he breaks through enemy defense .
Person2:He is competent both in driving the lane and shooting jumpers , but what really makes him formidable is his ability to switch up and dribble with his left hand .
Person1: Maybe he is not good at rebounding ?
Person2:Indeed , no man can be perfect . He is just so-so in crashing the boards . Usually he plays shooting guard . Rebounding might not be his strong suit .
Person1: Kobe came to Beijing during this summer's Olympics . Did you go to the match between China and USA ?
Person2:Who wouldn't ! My friend Lee went so far as to get an autograph from him .
Person1: Well then , what are your spoils ?
Person2:Well , nothing more than a jumble of photographs .

Answer:
formal