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:       Have you made a reservation , sir ?  
 Person2:Yes , I reserved a table for six people .  
 Person1:        Your name , please ?  
 Person2:Michael donsie .  
 Person1:        I see.We had a table reserved for you.This way , please . 

informal