You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Will you please book me a flight ticket from DEN to AUS?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I will start on July 28th and return on July 30th.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I need 1 stop over.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No, I am fine with above essentials.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Sandra Taylor.

ASSISTANT: Sorry, there are no flights available at your request.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for contacting us, have a nice day.