Hello.
user
Hello. How may I aid you?
assistant
 I am Donald Anderson.
user
Ok.
assistant
I want to change my reservation due to prepone of my meeting. Can you help me with it?
user
Sure, I will help you. Please, standby.
assistant
Ok.
user
Thanks for waiting. We could not find any reservation on your name.
assistant
Thank you for your help.
user
Thank you for approaching us.
assistant