Hi.
user
Hello. How can I assist you at this moment?
assistant
Owing to an emergency, my planned trip to Yosemite adventure 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, Linda Rodriguez here.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry Linda Rodriguez, no reservation has found under your name to  change.
assistant
Ok, no worries at all. Thank you for your information.
user
Thank you for choosing us, have a good day.
assistant