Hi.
user
Hello, how may I help you?
assistant
I want to change my existing reservation, can you please help me with this?
user
Sure, we are here to help you. May I know your name please?
assistant
I am Carol Lopez.
user
Sorry to inform you that there is no active reservation on your given name.
assistant
It's ok, thank you.
user
Thank you for reaching us, have a nice day.
assistant