Hello.
Hello. How can I help you today?
I want to change my existing reservation, which is done recently. Can you please help me out?
Sure, I will help you to change your reservation.
Thank you for considering my request.
May I know your name?
Sure, please check the reservation under the name of Deborah Lewis.
Sorry, no reservation found on your name to change your reservation.
Not a problem, anyway thank you for the information.
Welcome, have a nice day.