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: 'We have -10 degrees temperatures at night where I am camping!!' 'It is even worse here and I am not feeling well' 'I am just going to walk away from the deal,  my family can't freeze'
Utterance: 'You can take 1 firewood then'

SOLUTION: No

PROBLEM: Context: 'Haha yup me too. I have a teenage son who eats about 5000 calories a day. Okay, I think the most fair option is one of takes 2 firewood and 1 of the other two items. I don't care who.' 'Sure. How about you take 2 firewood, and 1 food and 1 water?' 'That's fine with me. This should be a great weekend to get out.'
Utterance: 'yes sounds good! hope it doesn't rain'

SOLUTION: No

PROBLEM: Context: 'Of course, it's always wise to bring things. We absolutely need water and some food. Water is critical though.' 'You got that right!  I just came from a three-day rugby tournament and I am totally dehydrated.  I hope they have enough at the site.  I also get the chills bigtime when I am dehydrated. That's how I know I am very dehydrated...' 'I'm good to give up firewood for more water and food.'
Utterance: 'Thanks!  You can have all the extra food. My pockets are jammed full of munchies.  But water is something it seems we both really need.'

SOLUTION:
Yes