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: Hey , Philip ! You won ' t believe this !
Person2:What ? What ' s the good news ?
Person1: My son , Harvey just got into Harvard ! He starts next September .
Person2:That ' s wonderful ! You must be really proud of him !
[A]: informal

[Q]: Person1: I don't know what to do about the people who live in the flat above me !
Person2:Why ? What are they like ?
Person1: They're incredibly selfish . They ' re always up until the wee hours of the night playing their music so loudly that I have to wear earplugs in order to fall asleep !
Person2:Have you ever talked to them about it ?
Person1: I tried to introduce myself to them when they moved in , but they were so arrogant that I didin't want to ever talk to them again !
Person2:What did they say ?
Person1: They both just talk about how great they are all the time .
Person2:They soud like the neighbours from hell !
Person1: They are ! Besides being loud and arrogant , they're also terrible gossips . They're always talking about everybody else in the apartment .
Person2:I thought you didn't talk to them much .
Person1: I don't , but they talk so loudly that I can hear what they're talking about from my bedroom - and it's not very nice .
Person2:What do the other people in your apartment think about them ?
Person1: Most of my other neighbours are scared of them .
Person2:Maybe you should think about moving .
Person1: I can't afford to move right now .
Person2:Well , perhaps you should have a party and try to get to know them better . Maybe once you get to know them , they'll turn out to be more sensitive .
Person1: I think you're being a bit optimistic . If you met them , you'd understand .
Person2:Well , I don't know what else you could do then . Do you think bribing them with chocolate would work ?
[A]: informal

[Q]: Person1: Mr . Lee , I was wondering if you and your wife had plans for next Friday night ?
Person2:Yes , I think we might be free . What did you have in mind ?
Person1: I've mailed a formal written invitation to your home inviting you to a dinner party at my home .
Person2:That sounds great . Is it casual ?
Person1: Actually , we thought it would be fun to have a formal sit-down dinner for the holidays .
Person2:That sounds good . It will give my wife a chance to dress up .
Person1: Yes , we've invited four other couples , so it should be a good mix of people .
Person2:That sounds wonderful . Will there be anyone there that I know ?
Person1: Oh yes , everyone we are inviting is from our company .
Person2:Great ! I'll look forward to it . We'll make sure and check the mail for our invitation .
[A]:
informal