Hello.
user
Hello. How can I serve you?
assistant
I want to attend a Seminar in San Francisco. Can you please help me for booking the flight ticket?
user
Sure. May I know your name.
assistant
My name is Patrick Turner.
user
When would you like to travel?
assistant
My travelling dates are Mar 22 and Mar 24.
user
Could you please let me know your  airport codes?
assistant
My airport codes are IAD and SFO.
user
Do you have any other specifications?
assistant
I want to travel in business class. I need single connecting flight.
user
Ok. We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.
assistant
Anyway, thanks for the information.
user
Thank you.
assistant