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: So did you get in touch with your brother ?
Person2:No , not yet . I'm really worried .
Person1: Well , it'd be foolish to call the police . He probably just went away overnight .
Person2:Maybe you're right . But I'm still worried .
[EX A]: formal

[EX Q]: Person1: Hello . I would like to buy some business cards .
Person2:Excellent . How many would you like ?
Person1: Two thousand would be fine .
Person2:You need to fill out this form , please .
Person1: All I want is the same thing on this card .
Person2:That will be no problem , sir .
Person1: ... Okay , I'm finished . Here's your form and my old card .
Person2:Very good , sir . Your order will be ready in one week .
Person1: Do you think you could finish it in three days ?
Person2:No problem , sir . But it will cost you extra .
[EX A]: informal

[EX Q]: Person1: What ? How could you forget to reserve the concert tickets ?
Person2:I'm sorry . I forget all about it .
Person1: How could you ? I reminded you just this morning .
Person2:It's leap my mind . I really feel terrible about it .
Person1: I have been looking forward to this performance all month .
Person2:I'm really sorry I let you down . I'll make it up to you somehow .
[EX A]:
informal