Hello.
Hello, how may I help you for the day?
My name is Jacob Moore. I want to change my existing reservation due to postpone of my conference.
Sure, we are here  to help you. Please wait for some time, I will check with your reservation status and revert to you.
Sure.
Thank you for waiting. Sorry we couldn't find any reservation against your name.
Not an issue, thank you for your service.
Thank you for approaching us. Have a good day.