Hello.
Hello, may I know your name?
I'm Amy Smith.
Amy Smith, tell me how may I help you?
I want to change my existing reservation, because of my postpone of my exam. Can you please help?
Ok, just hold on, I will check your previous reservation.
Sure.
I am sorry Amy Smith, there is no reservation found with your name to change.
Ok, that's fine.
Thank you for approaching us.
Thank you, for your kind information.
You are welcome.