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