Hi, Emily Rodriguez here.
user
Hello, how can I be your helping hand?
assistant
Owing to an emergency, my planned  for attending a workshop on Java has been postponed. So I want you to change my existing reservation?
user
Ok. Please wait a moment.
assistant
Sure.
user
Sorry, there is no reservation found on your name.
assistant
Ok, no issues. Thanks for your quality service.
user
Thank you for contacting us, have a good day.
assistant