You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you aid me to book a flight ticket from CLT to LAS?

ASSISTANT: Sure, may I know the planned travel dates?

USER: I planned my trip on the dates May 20 and May 22.

ASSISTANT: Please provide me the name.

USER: Myself George Collins.

ASSISTANT: Sorry, there are no flights are available for your desired dates.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for reaching us.