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:       Good afternoon , sir . May I help you ?  
 Person2:Yes , I'd like a cheeseburger and a large order of French fries .  
 Person1:        Would you like anything to drink with that ?  
 Person2:Yes , a medium Coke .  
 Person1:        Will that be all ?  
 Person2:Yes .  
 Person1:        For here or to go ?  
 Person2:To go , please . ( The attendant hands the customer his order . )  
 Person1:        That'll be $ 4.25 ... ( The customer gives her a 5 dollar bill . ) ... out of five . Here is your change , sir . Have a nice day . 

informal