TASK DEFINITION: The input is taken from a negotiation between two participants who take the role of campsite neighbors and negotiate for Food, Water, and Firewood packages, based on their individual preferences and requirements. Given an utterance and recent dialogue context containing past 3 utterances (wherever available), output Yes if the utterance contains the self-need strategy, otherwise output No. self-need is a selfish negotiation strategy. It is used to create a personal need for an item in the negotiation, such as by pointing out that the participant sweats a lot to show preference towards water packages.
PROBLEM: Context: 'I need the firewood and the food, you can have all the water.' 'no i need firewood to always keep myself warm.'
Utterance: 'So do I, I have health issues.  I can give you one firewood, if I get all the food. '

SOLUTION: Yes

PROBLEM: Context: 'i really need water and food. we did not get enough of those.' 'Those are my priorities as well, how about you get all the food and two firewoods, and i get all the water and one firewood, does that sound fair?' 'i would prefer water instead of food if possible, but i am sure we can work it out.'
Utterance: 'water is really important for me, how about i get two waters and three firewoods and you get three foods and one water?'

SOLUTION: Yes

PROBLEM: Context: 
Utterance: 'Hello, how are you today?'

SOLUTION:
No