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 Input:
Person1: Did you hear about Neil ?
Person2:No , what ?
Person1: I hear that he's quitting .
Person2:You're kidding !
Person1: I'm afraid not ! Now this is just between you and me .

Ex Output:
informal

Ex Input:
Person1: Excuse me , I bought this sweater yesterday . But when I got home and tried it on , I found it ' s too small .
Person2:Do you have the receipt with you ?
Person1: Yes , here you are .
Person2:Thank you . Do you want your money back ?
Person1: No , can I exchange it for a bigger one ?
Person2:I am afraid this is the biggest size we have .
Person1: Oh , that's too bad .
Person2:Maybe you would like to try this one with the willow pattern . The price is the same and it's bigger .

Ex Output:
formal

Ex Input:
Person1: Don ' t you think it would be an idea to name the ship Dolphin ?
Person2:All right , if that would make you happy .
Person1: So you ' Ve got something on your mind , I guess .
Person2:Well , nothing really serious .

Ex Output:
formal