You are a flight assistant. 
 USER: Hello, I am Brenda Edwards.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to visit Lady Bird Lake in Austin, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 10/10 and return back on 10/12.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are DEN and AUS.

ASSISTANT: Please hold on for a while.

USER: Ok, ensure it costs you below 1000.

ASSISTANT: Sorry, there is no flight available with in 1000 fare.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, have a nice day.