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: Who did the stupid thing ?
Person2:Maybe it was Dick .
Person1: I don't think so . Dick has been on the ball and never does things like that .
Person2:Then it must be a naughty boy who did it .
[A]: formal

[Q]: Person1: Did Bean send these dirty jokes to you , too ? Look !
Person2:What a creep ! Phony good luck e-mails are one thing , but sexual harassment is crossing the line .
Person1: No wonder he asked for my address first-he just wants to harass me !
Person2:You could try using a spam filter to reject stuff that's obviously pornographic or anything else you don't want .
[A]: informal

[Q]: Person1: Can you tell me what bus to catch from Altadena to downtown LA ?
Person2:You can catch the 486 .
Person1: That bus goes all the way to LA ?
Person2:I believe so .
Person1: Is the bus ride long ?
Person2:It only takes 45 minutes to an hour .
Person1: That's all ?
Person2:It's a pretty short trip .
Person1: Is there always a lot of people on that bus ?
Person2:It only gets crowded once it gets to LA .
Person1: Oh okay , thank you .
Person2:No problem .
[A]:
informal