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:       May I take your order now , sir ?  
 Person2:Yes , please . I'd like to start with a chef ’ s salad .  
 Person1:        Chef ’ s salad for starter . And what would you like to have for the main course ?  
 Person2:I'll have steak .  
 Person1:        How would you like your steak done ?  
 Person2:Medium .  
 Person1:        And what would you like to go with your steak ?  
 Person2:Peas and carrots .  
 Person1:        Potatoes ?  
 Person2:Boiled .  
 Person1:        Thank you . 

informal