Hello, My name is Deborah Hall.
user
Hello, Deborah Hall. How can I aid you today?
assistant
I want to change my existing reservation due to postpone of visiting New York. Could you please help me?
user
Sure, I will help you. Wait for a while.
assistant
Sure.
user
Thanks for your time. There is no reservation found  with your name.
assistant
No issues, Thank you for your valuable information.
user
Thank you for choosing us.
assistant