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: I need some flowers for my girlfriend .
Person2:No problem . Would you like some artificial carnations ?
Person1: Oh , no . Carnations are not very elegant.Artificial flowers have no passion .
Person2:How much did you want to spend ?
Person1: Money is no object .
Person2:Our most elegant flower is Golden Lily .
Person1: I will take ten .
Person2:Do you want to add some baby ' s breath for that ? They are equally popular now .
Person1: Of course . Can I have it delivered to my girlfriend's house this afternoon ?
Person2:Yes , but there is a five dollars delivery charge .
Person1: That's ok . Here is the address .
Example Output: formal

Example Input: Person1: Bob , you're so lucky that you've come at the right time-the 2005 International Tourism Festival is around the corner .
Person2:We've heard about that festival before . It would be quite helpful if you could give us some highlights of the festival .
Person1: My pleasure . Well , the festival is going to start on the third Saturday of October , and covers over one hundred diverse programs in one month .
Person2:What do you think we can see during the festival ?
Person1: I don't know what to suggest . There're so many attractions , and they all sound interesting . One exciting program might be the Ten Thousand People Cycling round the Town . You can choose from the five routes that lead to different destinations .
Person2:I'd like to take the one that goes to the Wild Animal Park .
Person1: Then you can take Route No . 5 . Next I would suggest the International Dragon Boat Race where you can watch Lion Dance , Dragon Boat racing , and many other water shows .
Person2:Wow , must be interesting to watch dragon boats compete a-gainst one another on the city river .
Example Output: formal

Example Input: Person1: I think I'll write a book .
Person2:What about ?
Person1: All of the time tested healthy habits from around the world .
Person2:You have done a lot of traveling . I'll bet you've learned quite a bit .
Person1: The interesting thing is to see what really works and what's just hype .
Person2:Because you can see the results with the general public ?
Person1: That's right . I think we all have much we can learn from each other .
Person2:I would buy that kind of book !
Example Output:
informal