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'.

Q: Person1: Excuse me , I'm a little lost . Which bus do I take to get to Shi Da ?
Person2:Let's see . From here , you have to take the 278bus .
Person1: Oh ok , where do I get off ?
Person2:You should get off at the first Shi Da stop .
Person1: Ok , thanks ...
Person2:You're new at this , huh ?
Person1: No , is it difficult ?
Person2:No , it's quite simple . When you get on , just ask the bus driver when to pay the fare and where you want to get off .
Person1: How much does it cost ?
Person2:Only 15 NT per section . Oh look , that is your bus .
Person1: Wow , I can't thank you enough .
Person2:Don't mention it .

A: informal
****
Q: Person1: Hi , Bob , this is Mary .
Person2:Hello , Mary , where do you work ?
Person1: I work for an Internet company .
Person2:Is the pay good ?

A: formal
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Q: Person1: It sounds that you have a high opinion of him .
Person2:He is an all-right guy . I have no bone to pick with him .
Person1: Birds of feather flock together .
Person2:But he is not a fine wether friend who could sell you down the river .
Person1: You cannot judge a person that way . I have a hunch that he is a sly dog .
Person2:Depends on with whom . He may be doing things on the sly , but he is honest with me . I trust him .
Person1: You can never tell . He might do you in when he sees an angle in doing it .

A:
informal
****