You are given a sentence from a conversation between a human and a virtual assistant. Your task is to classify the sentence into one of the following five action categories - INFORM, INFORM_INTENT, OFFER, REQUEST, REQUEST_ALTS. If the sentence is about informing something, generate 'INFORM'. If it is about requesting something, generate 'REQUEST'. If the sentence mentions requesting an alternative option than the one provided, generate 'REQUEST_ALTS'. Similarly, generate 'OFFER' if the sentence is offering some information. If the sentence is about showing intent to do something, generate 'INFORM_INTENT'.

Example Input: I'm looking for Hip Hop concerts in NYC.
Example Output: INFORM

Example Input: The DC United vs Revolution match at Audi Field? It happens on 8 days, the soonest being tomorrow.
Example Output: OFFER

Example Input: Is there a specific type of event you prefer, for instance Music or Sports or something else?
Example Output:
REQUEST