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'.

Q: Person1: How old are you ?
Person2:Nine ... but I'll be ten on May 1st.When is your birthday ?
Person1: I'm older than you ! I'll be ten on April 14th .
Person2:Are you going to have a birthday party ?
Person1: Maybe . I'll have to ask my mother .

A: formal
****
Q: 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 .

A: informal
****
Q: Person1: I'd be a basket case if you think of me that way . I need your understanding .
Person2:I know , I know . But you always bat around without doing things useful .
Person1: Can ' t you be more considerate ? I need your encouragement .
Person2:All right . Do what you can do now instead of twiddling your thumbs .

A:
informal
****