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 Q]: Person1: I'm reading an interesting report on Mars .
Person2:Oh , what does it say ? Does it say water could still exist under the surface of Mars ?
Person1: Absolutely ! It says there is water on Mars buried beneath the surface . It's just a matter of how deep it is .
Person2:Then could the soil on Mars somehow be fertile enough to Groh simple plants ?
Person1: The soil would need quite a bit of fertilizer to grow anything . And it would need to be protected from the UV radiation .
Person2:Actually , we are doing a project in school that involves landing a ship and staying on Mars for an extended period of time . Does NASA have any type of portable habitats that could be used to stay on the planet ?
Person1: I'm not sure NASA has built any portable habitats for extended stays on Mars , but they have looked at various designs .
Person2:One of the most exciting things about Mars is that there could have bean life on it . What are your personal opinions on the life on Mars theory ?
Person1: Well , I'm not really an expert in this area , but my understanding is that anything is possible . It's just that it is so hard to determine what went on 4.5 billion years ago .
Person2:But maybe there is a chance of gradually improving the surface and atmosphere of Mars so it may be inhabitable by humans .
Person1: I'm skeptical . Mars is made of rocks containing silicon , iron , and various minerals . It also has an atmosphere of carbon dioxide . It is so different from what we have on earth , you know .
Person2:I'd still like to hope that some day we could set up a human colony there .
Person1: But there are still other big problems we need to solve such as prolonged weightlessness , food storage , and a series of physiological effects .
[EX A]: formal

[EX Q]: 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 .
[EX A]: informal

[EX Q]: Person1: I will never forget Linda . After all , she was my first lover .
Person2:I think you ' ll lay it to rest with the time flying .
Person1: I remember that someone says that it is difficult to forget the people who don ' t want to forget .
Person2:But I think time can change everything .
[EX A]:
informal