You are a flight assistant. 
 USER: Hello, I am Carol Roberts.

ASSISTANT: Hello, how can I assist you now?

USER: Could you please make a reservation to Las Vegas under the fare of 200?

ASSISTANT: Sure, please share me your airport details?

USER: The airport codes are ATL and LAS.

ASSISTANT: Please also share me your journey dates?

USER: I want to visit a Bellagio on 05/14 and eturn on 05/16.

ASSISTANT: Do you have any price limit? Please wait for a moment.

USER: Ok, price is 200.

ASSISTANT: Thanks for waiting, sorry there is no any flight available on your details.

USER: No problem, Thank you for the information.

ASSISTANT: Thank you, have a nice day.