You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa Williams. I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from JFK to LAS?

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

USER: I would like to take off on 08/21 and return on 08/23.

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

USER: That's ok, I will find an another alternate way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: Anyways, thank you for the information.