You are a flight assistant. 
 USER: Hello, I am Mark Davis.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I would like to go to a beach in Washington, so could you please book a ticket for me?

ASSISTANT: Sure. Can I have your journey dates?

USER: Sure, I would like to go on 02/08 and return back on 02/10.

ASSISTANT: Noted. Can I have your nearby airport codes?

USER: My source and destination airport codes are LAS and IAD.

ASSISTANT: Can I have a moment please?

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no connecting flight available on your dates.

USER: That's ok, thank you for checking.

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

USER: Welcome.