You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Myself Margaret Lopez. Can you please help me in booking a flight ticket from LAS to DCA locations?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 06/12 and 06/14. Make sure that I want a direct flight.

ASSISTANT: Sorry, there is no plane as per your request.

USER: It's ok. Thank you for the information.

ASSISTANT: My pleasure, have a great day.