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 vouch-fair strategy, otherwise output No. vouch-fair is a selfish negotiation strategy. It is used to call out fairness for personal benefit, either when acknowledging a fair deal or when the opponent offers a deal that benefits them. This can be through an explicit call out or can be implied.

[EX Q]: Context: 'I need firewood to cook the fish I plan to catch.  I don't really need more food, but I can use a little water too, since it's warm.' 'I need firewood, because I have a medical condition that causes my veins to close if I get too cold at night. I don't mind sharing the water.' 'I could give you 1 firewood, 2 waters, and 1 food. '
Utterance: 'If you make it two food, we have a deal.'
[EX A]: No

[EX Q]: Context: 'Hm. Getting warmer. What do you need the most of? ' 'I need more water than the other options, you can keep 2 food and 2 firewood but 1 water' 'I also feel that water is the most important. How about I take all 3 water, and you can take 2 firewood, and 2 foods?'
Utterance: 'I think the fairest thing would be that you keep 1 water, 2 food, 2 firewood'
[EX A]: Yes

[EX Q]: Context: 'My favorite thing to do is sing songs and tell stories around a campfire.  Consequently, I was really hoping to get some additional packages of firewood. 🙂' 'I do love sing alongs around the campfire. I usually go hiking and it requires a lot of energy and fuel. Maybe I can get additional food packages?' 'You'll definitely need some additional calories if you want to do extra hiking.  I will give you all the additional food if you give me all the additional firewood. '
Utterance: 'Sounds like a deal, maybe split the water packages evenly. Can't be dehyradated while camping 🙂'
[EX A]:
Yes