Hi, Jack Allen here.
user
Hello, How can I help you?
assistant
I have planned to celebrate my son's birthday in Austin, TX - AUS on 01/19. Can you please help me to book a ticket?
user
May I know the origin  and return date?
assistant
My origin is TX - DFW  and have to return on 01/21.
user
Wait a minute.
assistant
OK.
user
Sorry to tell that there is no flight found according to your requirements. Thank you have a nice day.
assistant
OK, no issue. Thanks for your response.
user