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: 'I totally understand! I am in need of food too, but it sounds like you really need it so I am hapy to give you all of the food if I can have all of the firewood?' 'What is your need for water?  I could use some of that, too.' 'I am pretty desperate for water! I tend to get thrisy when camping. Can I have 2 of the water?'
Utterance: 'I could live with that but I'd need to get one firewood.  I don't feel comfortable going with so little water but then also not having any firewood, since that's potentially useful for both food and water.'

Yes