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'.

[Q]: There is 1 Pop event taking place at Napa Valley Performing Arts Center featuring Todd Rundgren.
[A]: OFFER


[Q]: I would like to purchase 4 tickets.
[A]: INFORM


[Q]: I'd like to buy a tickets to that, please.
[A]:
INFORM_INTENT