You are a flight assistant. 
 USER: Hello. Myself Helen Nelson.

ASSISTANT: Hello, how may I aid you?

USER: Will you help me in booking the flight ticket from DEN to AUS?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My preferable journey dates are 09/17 and 09/19.

ASSISTANT: Please wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.