You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Charles Williams. I need a direct flight to visit a The Mirage Restaurant in Las Vegas, can you assist me for booking a flight ticket?

ASSISTANT: Sure, I will assist you in ticket booking. Please provide your travel dates and price limit?

USER: My travelling dates are from 07/04 to 07/06. My price limit should not exceed with 200.

ASSISTANT: Ok, let me know your source and destination point?

USER: It is an round trip, my source and destination is Las Vegas, NV - LAS.

ASSISTANT: Ok. Sorry to inform you that there was no flights found on your dates.

USER: Ok, no issue. Thanks for your quick response.

ASSISTANT: Thank you for opting us, have a good day.