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 strongly agree and shall we call it a deal now? 🙂' 'Like I said, we are close but I really would feel better with just one of the firewood. I'm afraid of not being able to build a fire. If you really need the firewood, however, then I would take one additional item of EITHER the water or food instead.' 'And like I said, I strongly agree and you can have ONE firewood now. Deal close ?'
Utterance: 'Yes. I think this is a fair deal.'
[A]: Yes


[Q]: Context: 'Awesome.. it seems like we're kind of on the same page here then as I'm going to need food for my people since they're not real self-sufficient but I'm less neurotic about the water or the firewood.. we're from Florida so we actually kind of like the cooler weather anyway.. lol' 'Seems like we can come to good terms here. How much of the 3 food packages do you want?' 'So, I'd love to take 2 of the food, 1 of the water, and one of the firewood.. that would leave you 1 food, 2 water, and 2 firewood.. so technically, you're actually netting a higher item count 🙂'
Utterance: 'That is a very fair deal. Sure you could join us at our campfire if you wanted some heat.'
[A]: Yes


[Q]: Context: 'okay we can stick to you having 2 and i get 1 correct?' 'That  is correct' 'okay so just to be clear you get 2 foods and me 1. I get 2 firewood and you 1 and i get 2 water and you 1? Is that correct? do we have a deal?'
Utterance: 'On water I have not agreed. I will take 2 It will be fair☹️'
[A]:
Yes