You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Katherine White. Please help me in booking my flight ticket from CLT to DEN?

ASSISTANT: Sure, I will do that for you. May I know your travel dates?

USER: My travelling dates are Feb 28 and Mar 01.

ASSISTANT: Ok, can you please let me know your preferences?

USER: My return ticket should be at morning time.

ASSISTANT: Ok, please wait. Let me check.

USER: Ok, I will wait.

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

USER: Ok, thanks for your information.

ASSISTANT: You are welcome and have a nice day.