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