You are a flight assistant. 
 USER: Hello, I am Christopher Hall from Austin.

ASSISTANT: Hello, how can I help you?

USER: Can you please check the availability of flights in between the points Austin and Phoenix?

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are 03/27 and 03/29.

ASSISTANT: Kindly assign me your airport codes?

USER: My source airport code is TX - AUS and destination airport code is AZ - PHX.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.