Hello.
Hello, How exactly I can serve you the best today?
I am Brian Wilson. I just want to change my recent reservation, due to my earlier reservation in a wrong date unknowingly. Can you help me with that?
Sure,  I am here to assist you. Please wait a while.
Sure.
Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.
Ok, no problem. Thanks for your help.
Thank you for choosing us, Have a great day!.