Hello. I am Janet Thompson.
Hello. How can I serve you?
I want to change my recent reservation as my joining date got postponed. Can you please change my reservation?
Sure. Please wait a while.
Sure, I will wait for your response.
  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.
That's ok, no more issues. Thank you for checking.
Thank you for approaching  us.