You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Charles Robinson and I would like to book a flight ticket for house warming ceremony in Charlotte,NC-CLT on 07/14 .

ASSISTANT: OK. Can you provide me the details from where you start.

USER: My origin is Seattle,WA-SEA and my return date will be  on 07/16.

ASSISTANT: OK. Please wait for a minute, let me check your given details.

USER: OK.

ASSISTANT: Thank you, for waiting. Sorry, to say that there is no flight found on your details.

USER: OK, no issue.

ASSISTANT: OK. Thank you for choosing as.

USER: Thank you.