Hello. Debra Lee here.
Hello, what help do you need from us?
I was looking for a flight on the route from Washington IAD to San Francisco SFO for meeting my sister, can you help me?
Sure, I will help you.
Thank you.
Can you please mention your planned travel  dates?
I will be travelling from 07/27, I want return back on 07/29.
Ok, please hold on for a moment.
Take your own time.
Sorry to tell you, there are no flights found in this route.
Ok, thank you for assisting me.
Thank you for consulting us.