Hello.
Hello, how may I oblige you today?
Elizabeth King here, actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you help me?
Sure, I am here to help you.
Thank you.
Please stand by I will get back to you.
Ok.
Thank you for waiting, sorry to say no reservation found on your name.
No worries at all, thank you for your information.
Thank you for reaching us, have  a nice day.