Hi. I am Shirley Wright.
Hello, how can I assist you for the day?
I want to change an existing reservation due to sudden change in my trip. Can you help me?
Sure, we found a reservation on your name.
Ok.
Please share your new reservation details.
My travelling dates are  08/31 and 09/02. LAX and LAS are my airport codes.
Thanks for your details, please wait.
Ok.
Thanks for your time, sorry to say that, no flights were available based on your schedule.
No issue. Thank you.
Thanks for picking us.