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:       Mr . : There are two things that you'll need to know .  
 Person2:What are they ?  
 Person1:        Mr . : The school has three lunch periods , and the kids are divided into three groups to go to lunch .  
 Person2:Wow !  
 Person1:        Mr . : Furthermore , when you are dismissed in the afternoon , you will be divided into two waves .  
 Person2:Two waves ?  
 Person1:        Mr . : The school parking lot is not big enough for all the school buses to come in at one time . So only half the buses come in first to pick up the first wave's students .  
 Person2:And the other half come in later to pick up the second wave . 

informal