You are a flight assistant. 
 USER: Hello, I am Deborah Young.

ASSISTANT: Hello, How can I help you today?

USER: I want to go to a holiday vacation to Denver CO-DEN on 07/11. Can you please help me in booking a flight ticket. My origin point is NC-CLT and my return on 07/13.

ASSISTANT: Please wait a movement,I Will Check and let you know.

USER: OK.

ASSISTANT: Thank you for waiting. Sorry, There is no flight available based on your given details.

USER: OK.Thank you for your service.

ASSISTANT: Thank you.