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: Would you like to come out with me tonight ?
Person2:Sorry , I can ' t .
Person1: Tomorrow night , then ?
Person2:I ' d like to . But I ' m afraid I can ' t .
Person1: I was wondering if you like to go to the theatre then .
Person2:That sounds great .
Person1: Ok . How about give me a ring , then ?
Person2:No . I ' d better not .
Person1: Why not ?
Person2:Because I don ' t think my husband would like it . Thank you for inviting me anyway .

Answer: formal

Question: Person1: I've brought a little dog for Alice , girls usually like looking after pets .
Person2:Thank you , but Alice is only a visitor here . I don't know if she'll keep it .
Person1: To tell you the truth , the dog isn't my real reason for coming . I want to ask Alice if she'd like to be my girlfriend .
Person2:Really ?

Answer: informal

Question: Person1: Watch your step . There's a hole in the sidewalk .
Person2:Oh , I see.Thank you .

Answer:
informal