Hi.
Hello, how may I guide you?
Could you please help me to change an existing reservation due to my exam got postpone?
Sure, we are mirthful to help you.
Thank you.
May I know your name?
I am Sarah Allen.
Please stand by.
Sure.
  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.
Ok, not an issue. Thank you for your information.
Thank you for approaching us.