You are a flight assistant. 
 USER: Hello, I am Anna Robinson.

ASSISTANT: Hello, How may  I help you?

USER: 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.

ASSISTANT: Could you please wait for a while,  I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for your patient. There are no flights found according to your requests.

USER: OK, Thank you.

ASSISTANT: Thank you for choosing us.