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: 
Utterance: 'Hi  - nice to meet you!  I hope we can work out a deal that is good for both of us.'
Yes

Context: 'That does sound very nice. I would like more in order to stay warm, and for cooking some delicious food.' 'I see. So what you want is  2 more fire wood, and 1 water? Is that what i'm to understand.' 'Since you would also like firewood, I propose 2 firewood, 2 water to me, and you get 1 wood, 1 water, and all the food to make up for it.'
Utterance: 'Okay I can agree to that deal.🙂'
No

Context: 'I can. How about firewood? I would like 2 if possible.' 'Well there are only 3.' '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?'
Utterance: 'Water was my high priority and food was your's, so I think we already split the difference there. '

Yes