You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Virginia Martin.

ASSISTANT: Nice to meet you Martin.

USER: I am planning to attend nature festival in Dallas & Fort Worth TX-DFW, can you please book a flight ticket from Washington DC-DCA?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are 03/22 and 03/24.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.