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: Could you suggest another?
Example Output: REQUEST_ALTS

Example Input: I am looking for an event.
Example Output: INFORM_INTENT

Example Input: I'd like to buy tickets to the event.
Example Output:
INFORM_INTENT