Hello.
Hello, how may I aid you today?
Gregory Johnson here, I need to  amend my reservation. Can you help me out please?
Sure, I am here to help you out in amending your reservation. Please allow me a moment to check the reservation details on your name.
Ok, please check with that.
Sorry Johnson, there is no active reservation on your name in our database.
That's not issue.Thank you for the information.
Thank you for information.