Hello.
user
Hello. How can I  help you?
assistant
I need to change my existing reservation due to postpone of my event which was conducted by my friends. Could you please help me?
user
Sure, may I know your name please?
assistant
I am Charles Martin.
user
I am sorry no reservation found on your name.
assistant
No worries, thank you for the information.
user
Thank you for choosing us.
assistant