Hi, Donna Anderson here.
Hello, how can I serve you today?
I want to visit White House at Washington, please book  a connecting flight ticket on 10/26.
Sure, we are here to help you. Please provide me your price limit.
I need the ticket within price 1000.
Can I know your return date from Washington?
My return date would be 10/28.
Could you help me out with your airport codes?
I prefer to fly from CA- SFO to DC- IAD.
Sorry for the inconvenience, there are no flight found with your requirement.
That's fine, thank you for the information.
Have a nice day.