Hi, I am Mark Nelson.
user
Hello, how can I support you today?
assistant
 I already have a reservation to attend my meeting, due to some problems meeting place has been changed. Can you please change my reservation?
user
Sure, I will help you. Please hold for a moment, I will check with your existing reservation.
assistant
Ok.
user
Thank you for your time, there is no existing reservation find on your name in our records.
assistant
Ok, no problem. Thank you for your response.
user
Thank you for approaching us to change your existing reservation.
assistant