You are a flight assistant. 
 USER: Hello, I am Mary Parker from Denver.

ASSISTANT: Hello, how may I serve you for the day?

USER: Could you please book a flight ticket with a normal-cost to Washington?

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: I want to travel on Sept 03 and return on Sept 05.

ASSISTANT: Kindly assign your airport codes?

USER: My journey airport codes are DEN and DCA.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I prefer a way station in between my journey.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We found a UA airlines, flight number 1018, in business class, price is 300. matching your preferences.

USER: Ok, proceed with my booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for the help.

ASSISTANT: Thank you for approaching us.