Hello.
user
Hello, how can I help you?
assistant
I would like to change my existing reservation, please help me out.
user
Sure, let us know your name please, so that I can check for your reservation status.
assistant
My name is Jason Harris.
user
Sorry Harris, I have not found any reservation by your name.
assistant
Ok, no problem. Thank you for your information.
user
Thank you for reaching us and have a nice day.
assistant