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: That sounds perfect for me. I'd like to purchase tickets to the event.

A: INFORM_INTENT
****
Q: What are the events on some other dates?

A: REQUEST_ALTS
****
Q: Do you have preference for which city?

A:
REQUEST
****