Hello, Patrick Moore here.
user
Hello, how may I aid you today from my end?
assistant
 I need you to book a flight ticket from AUS to DTW.
user
Sure, I am here to help you out. Please provide me your trip dates.
assistant
March 20 and 22 are my planned travel dates.
user
Please allow me a moment.
assistant
Sure.
user
Sorry Patrick Moore, there is no flight in your route.
assistant
Nothing to worry. Thanks for your help.
user
Thank you for reaching us.
assistant