Hello, I am Janet Perez.
user
Hello, how may I best serve you today?
assistant
 already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me in changing the reservation?
user
Sure, please wait for a moment.
assistant
Ok.
user
Thanks for waiting, no reservation found with your name to change your reservation.
assistant
Ok, not an issue. Thanks for the information.
user
Thanks for contacting us.
assistant