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 evening . How many people of your party ?  
 Person2:Three . Two adults and one kid .  
 Person1:        For buffet ?  
 Person2:Yes . How much do you charge for it ?  
 Person1:        Thirty for each adult , twenty each kid .  
 Person2:I see . Where can I get the food ?  
 Person1:        Please go to the tables over there for cold dishes and vegetables . The hot dishes are on the other side .  
 Person2:Do I need to pay extra charges for drinks like cola and juice ?  
 Person1:        Not for soft drinks . But we charge ten yuan for each alcohol order . 

formal