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:       Yes , sir . What'll it be for you ?  
 Person2:Two hamburgers and French fries .  
 Person1:        Is there anything else ?  
 Person2:Give me two cokes also , please .  
 Person1:        Is this to go or to eat here ?  
 Person2:We'll eat here .  
 Person1:        Here you are . That's eight fifty .  
 Person2:And can I have some ketchup , please ?  
 Person1:        It's on the service counter over there . 

formal