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'.

[EX Q]: when does it start
[EX A]: REQUEST

[EX Q]: What type of event is this and what is the start time?
[EX A]: REQUEST

[EX Q]: Alejandro Sanz is playing at the Cal Coast Credit Union Amphitheater.
[EX A]:
OFFER