Hello.
Hello, how may I help you?
I want to do some changes in my existing reservation. Can you help me for that?
Sure, may I know your name please?
My name is Scott Clark.
Ok, please wait for a while.
Sure, I will wait for your response.
Sorry to inform you, there is no active reservation found with your name in our records.
That's ok, thank you for checking.
Most welcome.