Hi, I am Margaret Davis.
Hello, how can I serve you?
As my plan to visit  my grandmother's home got postponed, so I want to change my reservation. Can you help me with it please?
Sure, we are here to help you. Please wait a moment, I will check your details and revert to you.
Ok.
Sorry to say that there is no reservation found on our name in our reservation list.
  That's ok. Thank you for the response.
Thank you for reaching us.