You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me out in booking the connected ticket from DCA on Mar 28.

ASSISTANT: Sure, can I know your return date please?

USER: My return date will be Mar 30.

ASSISTANT: Can I know your destination airport code please?

USER: I want to return from JFK.

ASSISTANT: Ok, let me know your name please.

USER: Patricia Jones here.

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

USER: No problem. Thank you for checking.

ASSISTANT: Most welcome.