Hello. Scott Thomas here.
Hello, how may I render you today?
  I need to change my reservation as my plan to go for an historical tour got postponed. Can you please check if my reservation is active or not? If it is active, please change it.
Sure, I will help you with that.
Thank you.
Please wait for a couple of minutes.
Ok.
Thanks for waiting, no active reservation was found on your name in the database.
Ok, no problem. Thank you.
Thank you for availing us.