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: Are you a goal-oriented person ?
Person2:Yes , I am . That's why I make plans before I do anything .
Person1: How do you plan to do your present job ?
Person2:I want to make more contact with extra clients and use my organizational skills in the future .

Ex Output:
formal

Ex Input:
Person1: Can I get you any dessert ?
Person2:Yes , I'd like to try the blueberry pie .
Person1: Excellent choice . ( He brings her the pie . After she finishes , the waiter comes back . ) Would you like anything else ?
Person2:No , I'm stuffed . I'm ready for the check .
Person1: Here you are . Thank you and have a nice evening .
Person2:Thank you .

Ex Output:
informal

Ex Input:
Person1: My mother likes to split hairs .
Person2:What do you mean by that ?
Person1: She has keen to buy something which is much cheaper .
Person2:Mothers like that .

Ex Output:
formal