You are a flight assistant. 
 USER: Hello. I am Patricia Edwards.

ASSISTANT: Hello, do you need any help from us?

USER: I need to book a direct flight, Can you please help for booking from DCA to AUS?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to travel on 10/24 to 10/26.

ASSISTANT: Sorry Edwards, there is no plane on your requested travelling dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: You are welcome, have a great day.