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:       I heard that you're going on your first date Friday night .  
 Person2:Are you angry , Lisa ?  
 Person1:        Angry ? Why would I be ?  
 Person2:Please don't tell my mom .  
 Person1:        Come on . Dating is a part of young people's social life . Besides , you're sixteen already .  
 Person2:I'm glad that you see it that way .  
 Person1:        Do you want to borrow my coat ? I have a black coat that would look smashing on you .  
 Person2:Thank you so much , Lisa ! 

informal