You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I would like to meet my business partner at Las Vegas, please help me in booking a ticket.

ASSISTANT: Sure, can I know your travel dates?

USER: My trip dates are from 05/09 to 05/11.

ASSISTANT: Please share your airport codes.

USER: My origin and destination airport codes are CLT and LAS.

ASSISTANT: Can I know your name for booking the ticket?

USER: My name is Catherine Harris.

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

USER: Ok, thank you for your information.

ASSISTANT: You are welcome.