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: Don Broco will be playing at The Foundry on the day after tomorrow.
Example Output: OFFER

Example Input: What city are you looking for events in? You can also narrow down your search by topic, if you say something like Music or Sports.
Example Output: REQUEST

Example Input: Not quite what I'm looking for, what else do you have?
Example Output:
REQUEST_ALTS