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: Excuse me , can you recommend some places for us to go tonight ?
Person2:Since it's your first time to Vienna , I think you should go to the concert .
Person1: Good idea . My wife has a fine ear for music . I am sure she would like it .
Person2:Have a nice evening .

Answer: formal

Question: Person1: You wouldn't believe what happened to me today .
Person2:What ?
Person1: The teacher asked me to make a speech in English class and I wasn't prepared . He punished me by making me stand in front of the whole class . It was so embarrassing .

Answer: formal

Question: Person1: Last night I looked for my Indian classmate Barbara . I found her sitting with her legs crossed and quietly practicing .
Person2:Needless to say , it must be Indian Yoga .
Person1: Mary , you say something about it .
Person2:Tracing back , Yoga has a very long history . It was originated before India had approved Yoga and these documents were arranged and written according to the contents passed by mouth to mouth . In other words , Yoga is passed down from ancient times , which cannot be recalled .

Answer:
informal