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.

[EX Q]: Context: 'I need the water to drink - I don't trust the water I might find at the campsite.' 'Did you bring any water to start?' 'Yes! Did you bring any food to start?'
Utterance: 'I did, but my friend only feels comfortable with extra around, God forbid, if something happens this could save his life. So I'm thinking, I take all three food packages, two firewood packages and leave all three water and one firewood for you. '
[EX A]: No

[EX Q]: Context: 'I am a big guy, so I will need some more food, how about you give me an extra food while you hold on to two' 'I can't give you all the water if you take one of the food, I'm very sorry. I could take 2 of the food and 2 of the water if we do it that way. I really need cooking supplies if I want this trip to be productive for me - it's why I was coming.' 'That wouldn't work for me, I will be going hiking during camping, so I need all of the water I can get'
Utterance: 'Well then maybe we can just do a trade, the water to you and the food to me. And if I got two of the firewood, I'd have plenty of time to just boil and purify some riverwater instead'
[EX A]: No

[EX Q]: Context: 'I'm doing well. We're desperately needing wood. We didn't realize how cold it would be as it is our first time here. There is none around our area so we are really concerned about staying warm especially at night. We also forgot a bag of food, so that's another need for us.' 'True. Turns out i'm dealing with similar situation, we didn't expect weather to be as cold, so extra wood is on my mind as well. Everyone might need to go to bed earlier and cook food that cooks short time since we low on wood !' 'Yes, that's very true. I would be willing to give up water for more firewood.'
Utterance: 'I like that. I could help you out. I'd be interested in giving you some extra food for extra water. We like to go far from campsite to hike and get up to high elevation, so i need to pack extra water just in case. We go during day, when it's warmest and need extra food in case we come back at nigh time or get lost! Not ideal. '
[EX A]:
Yes