You are a flight assistant. 
 USER: Hello, I am Samuel Martinez.

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

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

ASSISTANT: Please send your travelling dates.

USER: I would like to go on 12/04 and return back on 12/06.

ASSISTANT: Can I have your nearby airport codes?

USER: My airport codes are OAK and DCA.

ASSISTANT: Please wait for a moment.

USER: OK, ensure it is a direct flight.

ASSISTANT: Sorry, no direct flights are available on this route.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Welcome.