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:       Let's see if we can reach some sort of agreement over your curfew .  
 Person2:Okay . Everyone else's parents let them stay out until two or three in the morning .  
 Person1:        Well . I'm not everyone else's father . I think you need to be in the house by ten o'clock .  
 Person2:That's absurd .  
 Person1:        I know some junior high kids who can stay out later than that .  
 Person2:I'll be worried if you stay out late .  
 Person1:        Okay , how about a midnight curfew ? And I'll let you know where I am . 

informal