Hi.
user
Hello, how can I assist you for the day?
assistant
Could you please change my existing  reservation due to postpone of my trip?
user
Sure, I am here to help you.
assistant
Thank you.
user
May, I know your good name?
assistant
My name is David Smith.
user
Sorry, we found no reservation on your good name?
assistant
Not a problem, thank you for checking.
user
Thank you for reaching us.
assistant