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: 'Hello. I'm looking forward to striking a deal with you that makes both of us happy!' 'Sure I am waiting too!'
Utterance: 'So tell me, which is most important to you? What can't you live without?'
No

Context: 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.' 'Hmmm i don't beleive i ever offered you everything for all the food. I will need at least one water. lets not be selfish.' 'Oh you are right sorry, I was mistaken.  Okay then, how about I get 1 food, 2 waters, and 3 firewood.  You can have 2 food and 1 water?'
Utterance: 'Well that would give you 6 rations and me 3. Again that is not very fair. If you want 1 food and all the fire wood that i need at least 2 waters. so again, 1 food, 1 water 3 wood for you'
Yes

Context: 'Ok thats fair, I would prefer to have more firewood since I'm awful at collecting firewood while out. But we could be a more even split of it all. 2/1 for both. Do you need more water or more firewood?' 'I need more firewood, I can maage with 1 additional package of water.' 'ok, so I'd get 1 firewood, 2 water. Now for food, If we continue with an even split I'd much prefer getting 2 extra food. that would bring us up to a near even split overall '
Utterance: 'Ok. I get it and that would be fair as I already have enough food.'

Yes