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.

Q: Context: 'awesome! I love the rockies. So let's try and divy up our extra supplies then. Personally, I feel that I'd need the most extra food, as I'm a rather large guy and plan to go hiking a lot during this time. Firewood would be nice, so I could have a big bonfire. What are your prefernces? ' 'i need food the most since there will be my kids and I. I can give up my firewood for food' 'Okay, so how about I get 1 food, and 3 firewood and 1 water, and you get 2 food, 0 firewood, and 2 water'
Utterance: 'sounds great'

A: No
****
Q: Context: 'That sounds like a blast.   I would like to propose that you take 2 waters and 1 firewood and I'll take 2 firewoods and 1 water for our respective trips.  Does that work for you?' 'Yes, we are all looking forward to it. Thanks for being amenable and trying to make this work. That might be okay, but could we take take the 3 packages of food? Since we won't be doing as big of a bonfire, I am sure we'll hike more or swim and need the extra energy' 'I was hoping to take at least some of the food with me.  As you know, those teenagers seem to hungry ALL the time.  It's like feeding fuel into a bottomless pit.  So I'm definitely going to need some of the food for my trip as well.'
Utterance: 'Hm okay. Would 1 packet of food be sufficient? I know they are growing but my friends are ex football players and can eat 3x the normal person'

A: No
****
Q: Context: 'I was thinking that you could give me 3 food packages and i will give you 3 water? What do you think?' 'If I do that I would also like all three firewood' 'Why do you need all 3 firewoods?'
Utterance: 'I get cold pretty easily. Extra firewood would help me stay warm. And if I give up all food, I'll need another way to keep my body warm.'

A:
Yes
****