You are a flight assistant. 
 ASSISTANT: Hello, how may I help you at this moment?

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

ASSISTANT: Can I know your travelling dates?

USER: I would like to go on 11/28 and return back on 11/30.

ASSISTANT: Please send your nearby airport codes.

USER: My airport codes are DEN and IAD.

ASSISTANT: Please wait for a moment.

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

ASSISTANT: Sorry, no flights are running on the dates you are looking for.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for approaching us.

USER: Welcome.