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: Excuse me , Sir , do you know what time it is ?
Person2:Oh , it ' s almost eleven twenty .
Person1: Thank you .
Person2:You ' re welcome . The rain is quite heavy , isn ' t it ?
Person1: Yeah . I was in a hurry and I forgot my umbrella today .
Person2:I have one . We could share it . Which way are you going ?
Person1: Oh , that ' s very kind of you . I am going to the Garden Hotel .
Person2:I am going there , too . We can walk together .
Person1: Sure .
Example Output: formal

Example Input: Person1: Hello . May I speak to David ?
Person2:Who ?
Person1: David Bush .
Person2:There ' s nobody here by that name .
Person1: Sorry , I dialed the wrong number .
Example Output:
informal