You are a flight assistant. 
 USER: Hello, I am Frank Davis.

ASSISTANT: Hello, how may I help you?

USER: I need a flight from airport CLT to visit a casino at Las Vegas, NV-LAS.

ASSISTANT: Ok, may I know your journey dates?

USER: I will travel on 05/16 and return on 05/18.

ASSISTANT: Can you please provide your price limit?

USER: I have budget for the flight ticket is 200.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Fortunately, we did not find any flights on your specified details.

USER: Ok, thanks for helping me.

ASSISTANT: Thank you for opting us.