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: He got the scholarship to Harvard .
Person2:You're kidding !
Person1: It's true . He is a hard worker .
Person2:I know he really deserves this .
[A]: informal

[Q]: Person1: T he nineteenth of June is my birthday . I'm planning to have a small party . Could you come ?
Person2:Happy birthday to you ! I'd really love to come , but I'm not sure right now . I'll try to make it.Thank you for your invitation .
[A]: informal

[Q]: Person1: I have failed in my final examination . What can I do now ?
Person2:You have asked me several times about it . You are driving me up the wall .
[A]:
informal