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: Come on , fellows.Let ' s enjoy my wife's cooking !
Person2:Em , it's delicious !
Person1: Thank you ! My wife likes cooking very much .
Person2:You're lucky .

Ex Output:
informal

Ex Input:
Person1: You don ' t look like enjoying this workout .
Person2:I ' m not crazy about it at all .
Person1: You don ' t like this sort of exercise ?
Person2:I ' m not interested in it . Are you keen on it ?
Person1: Yes , that ' s funny . I thought you liked it .
Person2:I hate it .
Person1: Never mind . It ' ll be over in 10 minutes .
Person2:It ' s the worst thing I ' Ve ever tried .

Ex Output:
informal

Ex Input:
Person1: Tyler residence .
Person2:Is this Naomi ?
Person1: No , this is her sister , Nancy .
Person2:You sure sound like Naomi .
Person1: Oh . Can I take a message ?
Person2:Sure . Please tell her that Andy called .
Person1: Okay . I'll give her the message .
Person2:Thanks .
Person1: Bye .

Ex Output:
informal