You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help in booking a flight ticket from LAS to DCA?

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

USER: My trip dates are May 7 and May 9.

ASSISTANT: Do you have any other requirements?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Let me know your name please.

USER: Myself Raymond Jackson.

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

USER: No issue, anyway thank you for checking.

ASSISTANT: My pleasure.