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