You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Raymond White. I have a business meeting in Washington, can you help me for booking a flight ticket from DCA to IAD?

ASSISTANT: Sure, I glad to help you out with that. May I know your travel dates please?

USER: My planning dates are from 01/21 till 01/23.

ASSISTANT: Ok, please be on hold, let me check for flight availability.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Raymond, there are no flights available for you in this route as per your travelling details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.