You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Lee.

ASSISTANT: How can I assist you at this moment?

USER: I am planning for the trip to Orlando, so I need a flight ticket from Washington. Can you please help me?

ASSISTANT: Sure, I can help you in booking flight ticket. Could you please mention your travel dates for booking flight ticket?

USER: The travelling dates are 05/20 and 05/22.

ASSISTANT: May I know your preferable airport code names for further process?

USER: The airport codes that I prefer to travel are from IAD to MCO.

ASSISTANT: Please give me a moment, I will check flight availability in this route.

USER: Sur, take your own time.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: It's ok, not an issue. Thank you for spending your valuable time for checking the flight.

ASSISTANT: Thank you for contacting us, have a nice day.