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