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'.

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 .
formal

Person1: So how's everything going for Christmas ?
Person2:I've got all the presents I need , and my family is working together to get all the food ready . That's easy , but I have another problem to deal with .
Person1: What's that ? Don't tell me you've still got Christmas cards to write , it usually takes my wife a month to write all of ours .
Person2:No , I did that a long time ago . It's about telling my son the truth about Santa Claus .
Person1: He still doesn't know that Santa isn't real ? How old is he , eight ?
Person2:Yes . He's never said anything so I never told him . But now that he's getting older ...
Person1: You think it's better that he should be told ?
Person2:Yes , he's too old to believe in that type of things . And I'd rather tell him before the kids at school do .
Person1: That happened to my oldest girl . She became really upset when her classmates told her Santa wasn't real .
Person2:I can understand . I was lucky with my oldest , she figured it out by herself and didn't tell my son .
Person1: Well , when you tell him , be gentle . It's hard for kids to find out something like that .
informal

Person1: Hi , Mary . I haven't seen you in ages ! I heard that you and Daniel are getting married on August 8th , the opening day of the 2008 Olympic Games . Is it true ?
Person2:yes , it is . We've been dating for over 7 years . We have decided to get married on a special day and we think August 8th , 2008 is a red-letter day .
Person1: good for you ! It sounds like you've done a lot of planning in a very short time .
Person2:yes , there is a lot of to be taken care of---wedding photos , wedding dress , catering , transport , hotel , etc ...
Person1: is everything ready now ?
Person2:almost . The only thing that isn't ready is the hotel . As a lot of people have chosen that day to get married , it is hard to find a hotel that isn't too expensive .
Person1: have you tried The Peninsula Palace Beijing ? My wedding reception was held there and they did an excellent job .
Person2:yes , we called , but it is booked up . The only choice is the Regent Beijing but we haven't made up our minds yet .
Person1: it's an excellent hotel . A friend of mine had her wedding reception there and said it was perfect , though very expensive .
Person2:that's why we want to have a look at other hotels . We don ' t want to spend too much on an extravagant wedding reception .
Person1: I guess you're right . I can help you ask other hotels . I am sure there are probably some available .
Person2:thank you .
Person1: my pleasure .
informal