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 morning . Can I help you ?  
 Person2:Good morning . I would like to make a reservation to Hong Kong for August 2 .  
 Person1:        Just a moment , please . I am sorry , sir . There is no ticket available on that day . But we have flights for Hong Kong the next day .  
 Person2:May I inquire about the departure time ?  
 Person1:        A 9:12 flight in the morning and a 14:00 flight in the afternoon .  
 Person2:When will the plane reach Hong Kong for the morning flight ?  
 Person1:        At 10:20  
 Person2:OK . I would like to book a ticket for that one .  
 Person1:        All right , sir . Please reconfirm your ticket no later than 12 noon two days before the flight ; otherwise , your reservation will automatically be canceled .  
 Person2:Yes , I know . What's the fare ?  
 Person1:        It's 500 dollars , not including ground transportation fares between the airport and downtown .  
 Person2:I see . Will it be doubled for the round trip ?  
 Person1:        Right , sir . And please do not forget to bring a valid travel document with you when you buy the tickets .  
 Person2:I won't . 

formal