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