Hello.
Hello, how may I help you?
I have to change  my reservation due to my planned event got postponed. So please help me with that.
Sure, I am here to help you for this. May I know your name please?
Thank you. Myself Barbara Jones.
Please wait for a while.
Sure, take your time.
Sorry for inconvenience, no reservation is found under your name to change.
Oh! It may not be booked properly. Anyway, thank you for your time.
Thank you very much for approaching our agency.