Hi.
Hello. How may I guide you now?
  I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Can you please help me in changing my reservation?
Sure, I will help you in changing.
Thank you.
Please, share me your good name to check your reservation status.
David Martinez.
Ok, please wait for a moment.
Ok.
Sorry to say that, we have not found any active reservation on your name in our records.
No issue, Thank you for the information.
Thank you for choosing us.