Hi.
Hello, how may I aid you today?
Can you help me to book flight ticket from DCA to OAK?
Sure, please share me your trip dates.
My trip dates are Dec 17 and Dec 19.
Do you need any specifications?
I need business class to travel with single connecting flight.
May I know your airlines preferences?
No, I do not have any particular airline preference.
Please mention your good name.
Sure, I am Eric Robinson.
 Sorry to say that, there are no flights available on the routes of your journey.
Ok, not a problem.
Thank you for reaching us.