Hi.
user
Hello. How can I assist you at this moment?
assistant
Owing to an emergency, my live concert got postponed, so I want you to change my existing reservation.
user
Sure, I am happy to help you with that. Can I have your good name please to check your reservation status?
assistant
Sure, Gary Williams here.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry Gary Williams, no reservation  has found under your name to change.
assistant
Ok, no issues. Thank you for your assistance.
user
Thank  you for choosing us, have a good day.
assistant