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.

[Q]: Context: 'i am already giving you all 3 food which i also need to eat' 'Would you be willing to trade a piece of firewood for an extra water bottle? That will save me some time from chopping down extra wood.' 'no, best i can offer is i get 3 firewood, 2 water and 1 food'
Utterance: 'No thanks.☹️'
[A]: Yes


[Q]: Context: 'Yes, can you live with two foods? ' 'I can. How about firewood? I would like 2 if possible.' 'Well there are only 3.'
Utterance: 'Of course. Since you're getting more water, I was hoping to get 2 firewood, and you could have the remaining 1. Would that work for you?'
[A]: Yes


[Q]: Context: 'Agreed.  Your fun trip could turn into something quite dangerous without that hydration.  ' 'Of course, that won't be fun. ☹️ So we have agreed' 'Mostly - since we cannot split the water 1-1, do you mind if I take the extra one? 🙂 '
Utterance: 'That's fine, you might need it more.'
[A]:
No