Definition: 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'.
Input:  Person1:       when do most children start school in your country ? 
 Person2:In America , most children start primary school at the age of five . 
 Person1:        How much time do primary school students usually spend at school every day ? 
 Person2:Kindergarten students usually only go to school for about four hours every day , but after that , they spend about eight hours in school every day . 
 Person1:        do they have to go to school on Saturdays ? 
 Person2:no , most children in America only go to school Monday through Friday . 
 Person1:        how many subjects do they have to study ? 
 Person2:In most schools , they study about nine subjects . 
 Person1:        do students have to wear uniforms in schools in America ? 
 Person2:some private schools require their students to wear uniforms , but public schools don't . 
 Person1:        did you go to a public school or a private school ? 
 Person2:I went to a private school for elementary school and university , but went to a public school for high school . What about you ? 
 Person1:        I went to a boarding school from nursery school to senior high school . 
 Person2:did you have to wear uniforms ? 
 Person1:        yes , they were horrible . We had to wear green every day ! 
 Person2:at least you didn't waste time thinking about what you were going to wear every day ! 
 Person1:        that's true ! 

informal