Hello.
user
Hello, how may I serve you?
assistant
I am looking to book a flight ticket from AUS to DCA. Can you help me for that?
user
Sure, I will help you. Please send your travelling dates on which you like to start and return back.
assistant
My travelling dates are Apr 25 and Apr 27.
user
Do you have any preferences?
assistant
No.
user
May I know your name please?
assistant
My name is Susan Robinson.
user
Sorry, there is no flight available with your requested dates.
assistant
That's ok, thank you for checking.
user
You are welcome, have a nice day.
assistant