You will be given a definition of a task first, then some input of the task.
Classify the given hotel review based on the sentiment it expresses into two classes: negative and positive.

The Chicago Hyatt Regency deceptively alters the cancellation policy by charging the full room rate upon cancellation--ie the room cannot be cancelled. I recently booked over the phone a one night stay directly with the hotel. The reservation specialist mentioned over the phone there was a 72-hour cancellation policy. However, when I tried to cancel the reservation within that timeframe, Robert, the reservation supervisor, said that the room could not be cancelled at any time without charging full price for the room. He said that I should refer to the confirmation e-mail that states at the bottom that prepayment is required at time of booking / non-refunable. This clearly was not what was agreed to over the phone. I told him to cancel without being charged. In response, he threatened to cancel and charge me for the full stay. Why would someone cancel if they are going to be charged full price? The bottom line is the hotel deceptively changed the terms of the agreement, and Robert should go back to customer service school!

Output:
negative