You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I want to travel from DCA to DEN. Can you help me to book a flight ticket?

ASSISTANT: May I know your travelling dates?

USER: I want to fly in the flight on Dec 26 and Dec 28.

ASSISTANT: Is there any connection limit?

USER: I am looking for a direct flight.

ASSISTANT: Do you have other requirements?

USER: No.

ASSISTANT: May I know your good name?

USER: Sandra Davis.

ASSISTANT: Please wait for a minute.

USER: Ok, take your time.

ASSISTANT: United Airlines providing direct flight in the economy class with fare 100, can I proceed for booking?

USER: Proceed to booking.

ASSISTANT: Your ticket has been confirmed with flight number 1012.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.