Hi. I am Brian Miller.
user
Hello, how may I help you for the day?
assistant
Please help me to changing an existing reservation as my plan to meet  my grand parents got post pone.
user
Sure, I am perky to help you. Please wait for a couple of minutes.
assistant
Sure.
user
Thank you for waiting, no reservation was found on your name in our database.
assistant
Ok, not an issue. Thank you for your information.
user
Thank you for availing us.
assistant