Hello, I am Lisa Hall.
user
Hello, how can I serve you today?
assistant
I want to change my existing reservation, can you help me with that?
user
Sure, please wait for a while I check for the reservation.
assistant
OK.
user
Thanks for waiting, sorry to inform you there is no any reservation on your name.
assistant
Ok, no issues. Thanks for making your safe service so kind.
user
Thank you, have a nice day.
assistant