instruction:
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'.
question:
Person1: There will be another sandstorm here tomorrow .
Person2:It's the fourth one this year . Isn't it horrible .
Person1: Yes . We should plant more trees and grass to stop the sand from spreading .
Person2:It may take many years for the trees to grow . I hope people will stop cutting down trees .
Person1: But we need the wood .
Person2:But we can't destroy our forests to get the wood .
answer:
informal

question:
Person1: Do you remember Tina , my good friend ?
Person2:Yes .
Person1: She just broke up with her boyfriend .
Person2:Well , that happens . I hope she is all right .
Person1: But the problem is she and her ex-boyfriend are working in the same department . It is somehow embarrassing for them to see each other everyday .
Person2:That is the down side of an office romance . I hope their work is not affected by the emotional stress . The boss must be very annoyed if that will be the case .
Person1: Well , Tina says she would be able to handle it and concentrate on her own work , easier set them done . But working harder and concentrating only on the job might well helped to overcome the initial stress of the breakup .
answer:
formal

question:
Person1: Hello . I am Bili and I made an appointment with you to see the house .
Person2:Glad to meet you . This way , please .
Person1: The house is a little too old .
Person2:But it's quite convenient for you to go to any part of the city . The subway is nearby .
Person1: Yes . That's why I like the house .
answer:
informal