Hello.
user
Hello. How can I aid you?
assistant
Myself Ronald Green. Due to some business meeting, I am going to change my reservation. Can you please help me for this?
user
Sure. Please, wait for a while.
assistant
Sure.
user
Sorry, there is no reservation found on your name.
assistant
Not a big problem, anyway thank you  very much for your service.
user
Thank you for opting us.
assistant