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: Hi , how are you doing ?
Person2:I'm fine . How about yourself ?
Person1: I'm pretty good . Thanks for asking .
Person2:No problem . So how have you been ?
Person1: I've been great . What about you ?
Person2:I've been good . I'm in school right now .
Person1: What school do you go to ?
Person2:I go to PCC .
Person1: Do you like it there ?
Person2:It's okay . It's a really big campus .
Person1: Good luck with school .
Person2:Thank you very much .
[A]: informal

[Q]: Person1: I'm going to America .
Person2:Any idea when you'll leave ?
Person1: I hope before the end of the month .
Person2:Let me know when you find out .
[A]: formal

[Q]: Person1: Hi , Ben . Here are the top ten of this week's top chart .
Person2:Oh , great !
Person1: Which is your favorite in this ten ?
Person2:I like No . 4 .
Person1: You mean Sweet Heart .
Person2:Yes . In fact , I think it's much better than this week's No . 1 .
Person1: What do you think about Cold Wind ?
Person2:I like it as well , but I don't think it's as good as Sweet Heart .
Person1: So No . 4 is your favorite . Which one don't you like ?
Person2:Well . I don't like Your Lips very much .
Person1: Why ?
Person2:I think it's too slow makes me sleepy . In fact , it's the worst in this week ' s top ten , if you ask me .
Person1: Really ? But it's my favorite .
[A]:
informal