You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best serve you today?

USER: I am John William, can you please make a reservation from AUS to PHX?

ASSISTANT: Sure, when are you planning to start and return on?

USER: My travelling dates are on Sept 03 and Sept 05.

ASSISTANT: Do you prefer a stopover flight?

USER: No, I need a direct flight.

ASSISTANT: Which class do you prefer to travel?

USER: I am okay with any class.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you.