Hi. I am David Campbell.
Hello. How can I aid you?
Can you help me in booking from SFO to IAH, as there is a business meeting?
Sure. Can I know your travelling dates?
My trip dates are 10/19 to 10/21.
Give me a minute.
Sure.
Thanks for your time. We found a Hawaiian  airline, flight number:1001 and the price is 1000. Can I reserve it?
No, don't book it.
Ok.
As I need a flight with fare 500.
Ok. Thank you.