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: Ahh ... What a fine day ! I do feel like an outdoor exercise .
Person2:How about taking a walk in the park ?
Person1: OK.It ' s delightful to have a walk in the park with the air so fresh .
Person2:Oh , it's so quiet here.We have the park to ourselves , only you and me !
Person1: Don't you see many people over there ? Just on your left .
Person2:Oh , I see them.Some are doing Taijiquan , some are performing swordplay , some are practising the Chinese Wushu .
Person1: A growing keep-fit fever is sweeping over China .

Answer: informal

Question: Person1: Who ' s this ? your girl-friend ?
Person2:No , it ' s my sister .
Person1: How old is she ?
Person2:She ' s 18 .
Person1: She is tall ?
Person2:Yes , she is .
Person1: And she is thin , isn ' t she ?
Person2:Well , just a little thin .

Answer: formal

Question: Person1: Do you mind if I get a lift in your car , please ?
Person2:I don ' t see any problem , only the car is a bit old .
Person1: Oh you ' re so kind !
Person2:Get in .

Answer:
informal