Hello, I am Amy Clark.
user
Hello, how can I abet you?
assistant
 I need to change my existing reservation due to postpone of my document verification in office. Can you help me in changing reservation?
user
Sure. Please wait for a while.
assistant
Sure.
user
Thanks for waiting, there is no reservation found on your name.
assistant
Ok, No problem. Thanks for sharing information.
user
Thank you.
assistant