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 Input:
Excellent. I would like to purchase tickets to this one.

Ex Output:
INFORM_INTENT


Ex Input:
No, actually I want 3 tickets.

Ex Output:
INFORM


Ex Input:
In Stanford please.

Ex Output:

INFORM