Hi.
Hello, how can I help you?
I am David Lopez. Can you please help me in booking  my flight ticket from SFO to IAH?
Sure, can you share your trip dates?
My travelling dates are May 21 and May 23.
Do you have any preferences?
I need my depart and return tickets at morning time.
Sorry, there is no flight on your given dates.
Ok, fine thank you for checking.
Thank you for reaching us.