You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Myself Alexander Carter. I am looking for a flight from DCA to DCA, as I planned for a round trip.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Ok, my journey starts at Nov 07 and returning on Nov 09.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: May I know your price limit?

USER: Price should not exceed than 500.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us, have a nice day.