You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samuel Miller.

ASSISTANT: How may I assist you?

USER: I would like to visit Carowinds Theme Park which is at Charlotte, NC - CLT. Can you please reserve me a flight ticket on 10/25?

ASSISTANT: Sure, please share me your return date?

USER: I intend to return on 10/27.

ASSISTANT: May I know your origin airport code?

USER: My origin code is Washington, DC - IAD.

ASSISTANT: Sorry there is no flight on your details.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you.