You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: This is Rebecca Moore, can you help me to book a flight ticket from CLT to IAH?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable journey dates are June 17 and June 19.

ASSISTANT: Do you have any specifications?

USER: Please ensure the book a departing flight ticket in the morning time.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: You are welcome.