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: Here's 30 yuan for my ticket .
Person2:Keep it . I'm buying tonight .
Person1: No , you can't do that .
Person2:Sure I can , my treat .

Answer: informal

Question: Person1: Look ! It ' s the start of the Olympic Games .
Person2:So what ?
Person1: You want to watch , don ' t you ?
Person2:Not really . I couldn ' t careless about the Olympic Games .
Person1: Please yourself .

Answer: formal

Question: Person1: May I ask who's the manager ?
Person2:I am . What can I do for you ?
Person1: I've something urgent to tell you .
Person2:Come on in , please .

Answer:
formal