Hello.
user
Hello. How may I assist you today?
assistant
Can you please  book  a flight ticket from AUS to DEN?
user
Sure, may I know your travel dates?
assistant
Thank you. I have planned my travel  dates as Apr 26 and Apr 28.
user
Do you have any specifications?
assistant
I would  like to depart in afternoon time so  please make sure  that.
user
Please share me your name.
assistant
Sure, myself Dorothy Mitchell.
user
Sorry, there is no flight at this moment.
assistant
Oh! It is sad to hear. Anyway, thank you for your time.
user
Thank you.
assistant
Most welcome.
user