Hi, I am Ronald Philips.
user
Hello,. How can i assist you?
assistant
I have a plan to get together with my friends  on 02/19 and I want to book a flight to Washington DC-DCA from Atlanta, GA-ATL. My return would be on 02/21.
user
May I know your departure date? OK, wait for a moment.
assistant
Sure, take your time.
user
Sorry, there is no ticket available on 02/19.
assistant
OK, thanks for your information.
user
You are welcome.
assistant