Hello.
user
Hello.
assistant
I want to book direct flight from OAK to DCA, can you please help?
user
Can you provide the travel dates along with your name.
assistant
I will start on Nov 21st and will return back on Nov 23rd. My name is Virginia Perez.
user
Do you have any  preferences?
assistant
I am looking for a for a normal-cost airline which departs in the afternoon.
user
Give me a moment.
assistant
Sure.
user
There are no flights available on your desired dates.
assistant
No problem, thank you for the information.
user
Thank you for approaching us.
assistant