You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Barbara Martinez. I want to attend an event in Las Vegas. Can you book a ticket from JFK to LAS?

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

USER: I want to travel on 12/11 and 12/13.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

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

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: You are welcome.