Definition: 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.
Input: Context: 'Ok, it gets a little complicated. But let's see what you think if I grab: 3 water 1 food and 0 firewood? And you would take: 0 of water, 2 of food and 3 of firewood' 'That is not a bad offer.  However, I would like at least 1 water for myself.  I would be willing to allow you 2 of the 3 waters though.' 'Ok what do you think then if I give you 1 more water and you give me 1 more firewood.'
Utterance: 'That is quite fair.  I would agree to that :)  Should we go ahead and submit it?'

Yes