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: '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.'
Yes

Context: 
Utterance: 'I will submit a deal that might benefit us both.  '
Yes

Context: 'Hi  I have an extra guest that will be camping with me and was wondering if you had an extra food package that you could spare?'
Utterance: 'I don't have much food, but you can take one package and I can take two? '

Yes