You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me to book a flight ticket from DEN to AUS.

ASSISTANT: Sure, may I know your trip dates please?

USER: My journey dates are from Aug, 09 to Aug, 11.

ASSISTANT: Do you have any other requirements?

USER: I need a single connecting flight and I prefer normal-cost airlines.

ASSISTANT: Can I know your name please?

USER: Pamela Jackson.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Thank you for your information.

ASSISTANT: Most welcome.