You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: William Parker here.

ASSISTANT: How can I assist you at this moment?

USER: I want to expand my casino business from Las Vegas to Charlotte, so could you book a flight ticket for me?

ASSISTANT: Sure, I am happy to assist you in booking flight ticket. Can you please mention your preferable travel dates for booking flight ticket?

USER: My itinerary dates are 02/04 and 02/06.

ASSISTANT: May I know your airport code names for further process?

USER: My genesis and terminus airport codes are LAS and CLT.

ASSISTANT: Just give me a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for contacting us, have a nice day William Parker.