You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Anthony Parker. I want to book a ticket from DCA to AUS to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I am departing on 01/14 and return on 01/16.

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

USER: That's ok, thank you for your information.

ASSISTANT: Most welcome.