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'.

[EX Q]: 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 .
[EX A]: formal

[EX Q]: Person1: I like hitchhiking.will you go with me ?
Person2:Oh , no . I don't think I'm in that good form .
Person1: It's a pity.Say , how about a place near enough ?
Person2:To where exactly ?
Person1: New England .
Person2:That's still too far for me .
[EX A]: formal

[EX Q]: Person1: Congratulations ! I heard that you are going to take a two-week training course in the headquarter .
Person2:Thank you . I am very happy to have this opportunity to learn something new . You know information and knowledge in this field update very fast .
Person1: Sure it is . This is a changing world . Does the training course cover the new law and regulation issued last month ? They are very useful for us .
Person2:Yes , according to the agenda , there will be a seminar on these issues at the very beginning of the training course .
Person1: Well , good for you . I hope you can get what you want from the training .
Person2:I will do my best .
[EX A]:
informal