Hi, William Clark here.
user
Hello, How could I support you?
assistant
Due to postponed of my exams, I want to change my existing reservation.
user
Sure, I am gratified to help you, Please wait a moment.
assistant
Can you help me with this?
user
Thank you for waiting, There is no existing reservation found on your name.
assistant
Can you help me?
user
Thank you for approaching us. Have a nice day.
assistant