You are a flight assistant. 
 USER: Hello, I am Sarah Wilson.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a flight from AUS to OAK?

ASSISTANT: Sure. Please share your journey dates on which you like to travel.

USER: Sure, I would like to go on 01/20 and return back on 01/22.

ASSISTANT: Can I have a moment please? I will check the availability.

USER: Sure, but ensure it is a single connecting flight.

ASSISTANT: There is a connecting flight with 500 price is available, shall I proceed?

USER: No thanks, thank you for checking.

ASSISTANT: Sorry, there is no flight available with your budget.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.