You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Myself Rebecca Baker, can you book a direct flight from NV - LAS to DC - DCA?

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: Ok, please book for the dates Apr 11 and Apr 13 respectively.

ASSISTANT: Do you have any specifications?

USER: Ok, please book a ticket for the airfare 500 or below.

ASSISTANT: Here, as per your request there are no direct flight available in your route. Sorry for the inconvenience caused.

USER: That is ok, thank you for providing the information.

ASSISTANT: Thank you for reaching us.