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:       Adam , could you show me around the school ? 
 Person2:No problem . 
 Person1:        What's the tallest building ? 
 Person2:You mean the white building near the playground ? 
 Person1:        Yes . 
 Person2:That is the library . And it has more than 1,000 , 000 books . 
 Person1:        What's the building to the south of the library ? 
 Person2:You know , our school is divided into two parts , the junior high school and the senior high school . That is the new classroom building for our senior high school . 
 Person1:        Is there a swimming pool in your school ? 
 Person2:Yes . There is a large swimming pool , but it is only available in summer . 
 Person1:        I do envy you . And I hope I can enter your school one day . 
 Person2:I believe that you can make your dream come true . 

informal