You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I can afford a low price for my ticket booking, so can you please find a flight below 500 budget for my ticket booking?

ASSISTANT: Sure, I will help you with that.

USER: Thank you .

ASSISTANT: Can I have your travel dates please?

USER: Sure, my travelling dates would be on 03/16 and arrival back on 03/18.

ASSISTANT: Ok, please provide me airport codes of your journey locations.

USER: Sure, my source region is NV-LAS and the landing airport code is TX-AUS.

ASSISTANT: That's fine, please be hold on for a moment, I will back to you.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: It's alright, is there any flights found in my route?

ASSISTANT: Sorry to inform you that no airlines is running a flight in your route on your planned travel dates.

USER: Ok, no problem, I will go for other booking agencies, thank you for your information.

ASSISTANT: May I know your good name for documentation purpose?

USER: I am Larry Phillips.

ASSISTANT: Ok Larry, thank you for utilising our service.

USER: Most welcome.