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:       Mary , can you help me set the table ? 
 Person2:Sure . 
 Person1:        This is usually my chore . 
 Person2:I don't mind helping . 
 Person1:        We need to set the table for four . 
 Person2:So that's four plates , four forks , four knives , and four spoons ? 
 Person1:        That's right . Mom didn't know where to buy chopsticks for you . 
 Person2:Don't be silly ! I know how to use knives and forks . 

formal