You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: George Lee here.

ASSISTANT: How may I assist you Lee?

USER: Reserve a flight ticket that is from AUS to PHX.

ASSISTANT: Sure, I am glad to help you. Can you please provide your preferable dates of travelling?

USER: My travelling dates are from 07/21 to 07/23.

ASSISTANT: Ok, please wait a moment to check the flights availability.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your requested dates of travelling.

USER: Ok, not a problem. Thank you.

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