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: I'd like to say good-bye to everyone .
Person2:What time are you going ?
Person1: My plane leaves at seven twenty-five .
Person2:Well , good-bye and have a good trip !
Person1: Good-bye . Remember to look me up if you're ever in Washington .

Ex Output:
informal

Ex Input:
Person1: Do you think it's time to sign the contract , Mr . Simpson ?
Person2:I'd like to look it over before I sign it .
Person1: OK , no problem . I hope there are no questions about the terms .
Person2:I am fully satisfied with the terms of this contract .
Person1: Shall we sign this contract now ?
Person2:OK . Where do you want me to sign ?
Person1: Just sign at the bottom .
Person2:OK . ( Sign ) Once a contract is signed , it has legal effect .
Person1: You're right . Thank you for your cooperation .
Person2:It's my pleasure .

Ex Output:
informal

Ex Input:
Person1: Hey , Mom , look what I found !
Person2:Good heavens ! Don't bring that frog in the house .

Ex Output:
informal