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.

Context: 'Firewood is not overly interesting to me, but water is somewhat enticing.' 'Ok, great - I can give you all of my waters in exchange for a majority of the food and half of firewood' 'Half of firewood? There are 3 so one of us has to get more. I would need more of that. '
Utterance: 'Yep, I know there's three and no way to split evenly lol - can you give me a justifiable reason as to why you deserve more over me? Please convince me.'
Yes

Context: 'Would it be possible to get an extra water also?  How do you feel about the firewood?  I wish we could split everything evenly.🙂' 'Me too. Firewood is the most important thing to me. We will be somewhere cold and we could use the extra warmth.' 'True.  How about I get 2 food, 2 water and 1 firewood. And that will leave you with 2 firewood, 1 water, and 1 food? '
Utterance: 'What do you need the extra water for?'
No

Context: 'how many water you need?' 'In a perfect world, all the water 🙂' 'that won't be fair, how about I get 1 water, 3 food and 1 firewood, that way u get the most water'
Utterance: 'Interesting.  If I decided to forgo water completely, would you accept giving me everything else?'

No