Hello.
user
Hello, how may I guide you?
assistant
My appointment with my manager has postponed, so I would like to changing my existing reservation, will you help me with this?
user
Sure, I am glad to help you. Can I know your name please?
assistant
My previous reservation has been done with the name of Richard Miller.
user
Miller, no reservation found with your name to change further.
assistant
Ok, not an issue. May be something went wrong while booking the ticket.
user
Ok.
assistant
Thank you for providing information.
user
Thank you.
assistant