Hello.
user
Hello. How can I assist you at this moment?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure, I am happy to help you with that. Can I have your good name please to check your reservation status?
assistant
Jessica Robinson.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry Jessica Robinson, no reservation has found under your name  to change.
assistant
No problem, thanks for your information.
user
Thank you for choosing us, have a good day.
assistant