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 also need more firewood.  I thought I would be able to find enough around the campsite but I guess that rain got us both 😮' 'yeah, horrible way to start the trip but I am sure it will get better. if i can have 2 of the fire wood you could have all three of the extra water' '🙂 Okay, I'll consider that since I do need some more water.  How should we split up the food?'
Utterance: 'well if your getting all 3 food and 1 of the fire wood how about i get 2 food and you get one? then it is more or less even'

Yes