You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Moore.

ASSISTANT: How may I assist you Moore?

USER: I am planning to visit a Washington, can you find a ticket for me?

ASSISTANT: Sure, we are gleeful to help you. Could you please provide your nearest airport codes for booking?

USER: Sure, my airport codes are from LAS to IAD.

ASSISTANT: Ok, may I know your preferable dates that you want to travel?

USER: Ok, my planned trip dates are 05/07 and 05/09.

ASSISTANT: Please hold on to check the flights.

USER: Ok.

ASSISTANT: We are sorry to inform you that, there are no flights available in your travel locations with your requested dates of travelling.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.