Hello.
user
Hello. How can I help you today?
assistant
I want to change my existing reservation, due to some health issue. Can you help me?
user
Sure, I am here to help you with that. Can you please share your name?
assistant
Ok, I am Mary Lopez.
user
Please allow me a moment.
assistant
Sure.
user
Sorry,  there is no reservation found on your name in our database.
assistant
Ok, not a problem. Thank you for your help.
user
Thank you for reaching us, have a nice day.
assistant