You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Nicholas Smith here.

ASSISTANT: Welcome to flight booking agency Nicholas Smith.

USER: Please help me out in booking the ticket from AUS to ATL.

ASSISTANT: Sure, will you please provide your preferable departure and return dates of travelling?

USER: My trip dates will be 06/29 to 07/01.

ASSISTANT: Do you have any other specifications?

USER: As, my budget is low I can afford only up to 500.

ASSISTANT: Please wait a moment to check the flights on your route.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to region with your planned dates of travelling.

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

ASSISTANT: Thank you for reaching us, have a great day.