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: 'Then it is good deal.  I need two wood, 1 food, and 1 water.' 'I really need all the food, I have a lot of people to feed' 'I will provide you the food, but I am asking only one for my people.'
Utterance: 'I am giving you all the water,  how come you need the food? '

SOLUTION: No

PROBLEM: Context: 'I do need at least one extra water bottle in case the fire goes out of control, but I am willing to forgo any food as I can forage for food.' 'Alright. Thanks. I only ask for so much of the water because I am overweight and I know while camping I'll work up a huge sweat.' 'Great, that sounds good to me, are you okay with keeping all the food or would 3 be too much?'
Utterance: 'I'd be ok with keeping all the food. I do eat a bit too much and if for some reason I get lost it would be helpful to have!'

SOLUTION: Yes

PROBLEM: Context: 'I can give you 3 firewood, but only 1 food and no water.' 'Good gravy! I will need to cancel the expedition if that's all you have to spare. Can you surely do no better?' 'I do like to have lots of water because I get thirsty on some of my longer hikes. How about I give you 3 firewood, 1 food and 1 water?'
Utterance: 'I see. I can get by without the water, but I need more food. With 2 food, I will probably need to eat my dog, but I will survive. Will you give me 3 firewood, 2 food, and no water?'

SOLUTION:
Yes