You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to book a flight ticket to JFK from DCA, can you please help me out?

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

USER: Sure, my planned travelling dates are Apr 25 and Apr 27.

ASSISTANT: Do you have any other requirements?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Ok, can I know your name please?

USER: sure, my name is Jonathan Campbell.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

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

USER: It's ok, thank you for the information.

ASSISTANT: Most welcome.