Hello, I am Anna Robinson.
user
Hello, How may  I help you?
assistant
I have planned for a holiday trip at Washington, DC - DCA on 08/22. I want to reserve a ticket from Austin, TX - AUS on 08/20.
user
Could you please wait for a while,  I will check and get back to you.
assistant
Sure.
user
Thank you for your patient. There are no flights found according to your requests.
assistant
OK, Thank you.
user
Thank you for choosing us.
assistant