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: '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.'
Yes

Context: 'but i can't give you 3 food and 3 firewood, thats 6 items vs the 3 water' 'Sure you can.  If you really want water the most, why would you care about the rest as much?😮' 'most does not mean i have to neglect the rest, anyways either a) I get 3 water, 2 food and 0 firewood or b) I get 1 water, 2 food and 2 firewood'
Utterance: 'That is simply unacceptable.'
Yes

Context: 'that won't be fair, how about I get 1 water, 3 food and 1 firewood, that way u get the most water' 'Interesting.  If I decided to forgo water completely, would you accept giving me everything else?' 'no, at the most i can do is i get 2 water, 2 food and 0 firewood or I get 1 water, 3 food and 1 firewood'
Utterance: 'But you get everything you wanted. You said you needed 3 water, I offered it to you.'

Yes