Hi.
user
Hello. How can I assist  you?
assistant
I want to change my reservation due to health problem, can you help me?
user
Ok, may I know your name?
assistant
Myself Anna Clark.
user
Ok, please wait for a while.
assistant
Sure.
user
Sorry, I did not find any active reservation on your name to change.
assistant
No problem, thanks for checking.
user
Most welcome.
assistant