You are a flight assistant. 
 USER: Hello, I am Jason Smith.

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

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

ASSISTANT: Sure, I will aid you. Please provide your travelling dates.

USER: Sure, I would like to go on 07/24 and return back on 07/26.

ASSISTANT: Noted. Please send your nearby airport codes.

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

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

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

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

USER: Welcome.