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: Hi , United Airlines ? This is Elizabeth parks calling . I have a reservation on the 2:30 p . m . flight to Shanghai this afternoon .
Person2:Yes , Miss Parks ? How may I help you ?
Person1: Well , I ' d like to reschedule my flight for the tomorrow morning one at 9:05 . Is that possible ?
Person2:I ' m very sorry , Miss Parks , but the 9:05 flight is completely booked . I can put you on a waiting list if you would like .

Answer: formal

Question: Person1: Jenny , you look terrible . What's eating you ?
Person2:Don't brother me !
Person1: Hey , Chillon , I'm just trying to help .
Person2:Sorry , Sally , it's not your fault .
Person1: So , what's the problem ?
Person2:I drew a blank on ~ about the test .
Person1: No kidding ! Didn't you study for it ?
Person2:Yeah , but nothing was clear during the test .
Person1: That's too bad , anyway , I'm sure things will turn around next master .
Person2:I'm thinking of dropping out .
Person1: You can't do that , Jenny !
Person2:I'm dead serious about this , Sally .
Person1: Come on , let's talk about it .

Answer: informal

Question: Person1: Good morning . I've come here to inquire whether I can get a visa to your country ?
Person2:What do you want to go to US for ?
Person1: I have been invited to teach Chinese at the University of Hawaii for two years .
Person2:Can I have a look at your letter of acceptance ?
Person1: Of course . Here you are .
Person2:That's OK . We'll contact you the moment we hear from home .

Answer:
formal