Hello, Nicholas Miller here.
user
Hello, how may I help you today?
assistant
Due to the sudden change in climate, my business conference got postponed. So I had a request to you to change my existing reservation.
user
Sure, I am happy to help you for that. Please wait, I will get back to you.
assistant
Sure.
user
Thanks for waiting, Sorry to say you that we have not found any reservation on your given name.
assistant
Thanks for your valuable information.
user