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: Did you listen to the weather forecast ?
Person2:No.Why ?
Person1: There ' s a typhoon coming .
Person2:No way !
Person1: Yep , it should be here by tomorrow night .

Answer: informal

Question: Person1: Hey , Philip ! You won ' t believe this !
Person2:What ? What ' s the good news ?
Person1: My son , Harvey just got into Harvard ! He starts next September .
Person2:That ' s wonderful ! You must be really proud of him !

Answer: informal

Question: Person1: Do you have any idea what time it is ?
Person2:My bad . I didn't realize that it was so late .
Person1: Do you really think that that excuses your tardiness ?
Person2:Of course not . I really did lose track of time .
Person1: Didn't I tell you to call when you're running late ?
Person2:Yeah , you did . I just forgot to call .
Person1: It doesn't matter , you should have called and let me know .
Person2:That's true . My bad for not calling .
Person1: If you do this again , don't even bother coming home .
Person2:You're going to kick me out over this ?
Person1: Exactly , maybe that'll teach you to respect my rules .
Person2:Well , if I'm not living here anymore , then I won't have to listen to your rules .

Answer:
informal