Hello.
user
Hello, how may I help you today?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure, can I have your name to check with the details.
assistant
My name is Stephen Carter.
user
Please wait a moment.
assistant
Sure.
user
Sorry, there are no active reservation on your given name to change.
assistant
No problem, thanks for your information.
user
Thank you for reaching our service.
assistant