Hello.
user
Hello, how may I serve you at this moment?
assistant
I would like to change my existing reservation, which is done recently. Can you please help me out?
user
Sure, we are here to help you.
assistant
Thank you for considering my request.
user
May I know your name to check your reservation status?
assistant
Sure, myself Rebecca Baker.
user
Thank you for waiting.
assistant
Ok.
user
Sorry, there are no reservation found with your name in our records.
assistant
Not a problem, anyway thank you for the information.
user
Thank you for choosing us with a query.  We hope to serve you again. Have a nice day.
assistant
Thank you for your service.
user