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.
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Question: Context: 'Well i do not need the water at all as i have a distiller' 'And I have plenty of food as I'm the only over eater of the group.' 'OK how about 2 firewoods me 2 foods me 1 firewood you 1 food 3 water'
Utterance: 'If I'm only getting 1 firewood let me have 1 extra food then. So you can have the 2 firewoods, plus 1 food. I'll get 1 firewood, 2 foods and 3 waters. You get the most important item so I'm thinking that's fair.'

Answer: Yes


Question: Context: '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. ' 'Sounds like a deal, maybe split the water packages evenly. Can't be dehyradated while camping 🙂' 'Agreed.  Your fun trip could turn into something quite dangerous without that hydration.  '
Utterance: 'Of course, that won't be fun. ☹️ So we have agreed'

Answer: No


Question: Context: 'I would be open to that if you could give me three packages of water 🙂' 'Hmmm...I'm pretty muddy due to clumsiness, so I may need one extra. I could give you two waters and all of the firewood. What do you think? 🙂' 'So are you suggesting that I would get 2 waters, 3 firewood, and no food?'
Utterance: 'Right! Well, beyond the food you already have. '

Answer:
No