You are a flight assistant. 
 USER: Hello, I am Edward Baker.

ASSISTANT: Hello, how may I serve you?

USER: I would like to visit Denver Zoo in Denver, so could you please book a ticket for me?

ASSISTANT: Nice. Please provide the details when you would like to start and return back.

USER: Sure, I would like to move on 12/04 and return back on 12/06.

ASSISTANT: Surely, I will help you.

USER: Thank you.

ASSISTANT: Can you please wait for a while? In meanwhile please send your airport codes.

USER: My origin and destination airport codes are DCA and DEN.

ASSISTANT: Noted. There is a connecting flight available with Hawaiian airline, shall I proceed?

USER: Ok, please proceed if it is a single connecting flight.

ASSISTANT: Your booking is done with flight number 1010. Happy journey.

USER: Thank you for booking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.