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:       Are we going to have gym class tomorrow ?  
 Person2:Are you crazy ? Tomorrow's Saturday .  
 Person1:        Sometimes I forget that we don't have school on Saturdays .  
 Person2:Americans also don't go to work on Saturdays .  
 Person1:        So there are only five working days in a week ?  
 Person2:Right . What are you going to do tonight ?  
 Person1:        I'm going to study .  
 Person2:On a Friday night ?  
 Person1:        Well , I need to polish up my English . 

formal