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:       Is there anything wrong with your food this evening , Miss ?  
 Person2:Sorry to trouble you . But I don't think this fish is fresh . It actually tastes a bit off .  
 Person1:        Sorry , Miss . I'll place it immediately , can I get you another drink , or you wait ?  
 Person2:No , please don't do that . I'd just like to return it .  
 Person1:        I'm sorry , Miss , but I'm afraid we can't do that . You'll order something else instead . I'd love to suggest the steak , it's the special today , and quite tasty .  
 Person2:Ok , then please bring me the steak mediun-rare , thank you .  
 Person1:        Ok , Miss . I hope you enjoy the rest of your dinner . 

informal