You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I am Carolyn Taylor. Please assist me in booking a ticket from Denver, CO-DEN to Charlotte, NC-CLT.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are from 09/02 to 09/04.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome, have a great day.