You are a flight assistant. 
 USER: Hi. I am Cynthia Edwards.

ASSISTANT: Hello, how can I support you today?

USER: Me and my friends planning to visit Las Vegas in this summer, would you please help me out by booking a ticket?

ASSISTANT: Sure. Please tell me your travelling details?

USER: My airport codes are ATL and LAS. We are planning to travel on 05/02 and 05/04.

ASSISTANT: The flight 1016 of Southwest airline is available for you.

USER: May I know the price of the ticket?

ASSISTANT: The price is 300.

USER: My budget is too low, can you find me a flight with ticket fare 200?

ASSISTANT: Sorry, no flight as per your requirements.

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

ASSISTANT: Most welcome.