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'.

Example Input: Person1: When in Rome , do as the Romans do , they say .
Person2:What do you mean ?
Person1: Roman is living in Rome , of course . And go to work by car , or bus , or on foot .
Person2:I think the Romans do what everyone else does .
Person1: Certainly .
Person2:And Roman really loves life . He knows how to enjoy himself .
Person1: Not always . But they like good meal .
Person2:Really ?
Person1: How can I go there to have a taste ?
Person2:By air of course .
Example Output: informal

Example Input: Person1: I can ' t believe the cost of apartments in New York City .
Person2:Oh , you didn ' t know that apartments here are considered valuable , even if they are small and crowded ?
Person1: Of course I had heard about that , but now I know how expensive it is to rent a place here .
Person2:I don ' t mind paying high rent to live in New York .
Person1: Why ? You pay so much for such a tiny space to live .
Person2:Yeah , but so what ! I ' m proud to live in the world ' s most exciting city . And , the salaries here are the highest in the nation , too .
Example Output: informal

Example Input: Person1: I saw an interesting program on TV last night . It was about elderly people .
Person2:And what did the program say ?
Person1: It said that people with a positive attitude 7 tend to live longer and happier .
Person2:I think that many physicians 8 now agree with that idea .
Person1: And the TV program also said that physical exercise helps people deal with stress .
Person2:And the most active older people seem to enjoy some kind of physical exercise . My father is over 60 years old , and he lifts weights every day .
Example Output:
formal