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: Good afternoon madam . What can I do for you ?
Person2:Hi . I want to check out . My room is 1005 .
Person1: OK . Please hold on a minute . So you checked in on Monday and stayed 3 nights in single room 1005 . Is that right ?
Person2:Yes . Can I have a look at my bill ?
Person1: OK . Here you are . If there are no questions , could we have your signature in the blank below ?
Person2:OK . I would like to have my receipt report , please .
Person1: Here it is . We are pleased to serve you here and we look forward to seeing you again . Wish you have a good day .
Example Output: informal

Example Input: Person1: Did you go to the concert last weekend ?
Person2:No , I didn't . And you ? Was it good ?
Person1: Yes , I did . I enjoyed it a lot.There was a folk singer , a violinist and a pianist .
Person2:How much was the ticket ?
Person1: I only paid two dollars for mine .
Example Output:
informal