TASK DEFINITION: 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'.
PROBLEM: No, I've changed my mind. I actually need 4 tickets.

SOLUTION: INFORM

PROBLEM: No. Do you have anything else?

SOLUTION: REQUEST_ALTS

PROBLEM: Is there a city that you're interested in and a particular type of event? Perhaps music or sports?

SOLUTION:
REQUEST