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