Hello, my name is Raymond King.
user
Hello, how can I help you?
assistant
I would like to attend my friend's birthday at Washington, please book a ticket from ORD to DCA.
user
Ok, may I know when are you planning your journey?
assistant
My preferred dates are 09/04 and 09/06.
user
King, please give me a minute.
assistant
Sure.
user
There are no flights available with your preferences.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for contacting us, have a good day.
assistant