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: 'water, food then firewood. It's really hot so I need to make sure we are hydrated. We forgot a bag of supplies that had mostly food so we really could use food. It's hot so firewood isn't necessary. If anything we can get it from around or on a hike.' 'of course, we should help one another, we will figure something out i'm sure' 'Yes, I think we can. I'm thinking 3 water, 2 food and 1 firewood for myself? How does that sound to you?'
Utterance: 'i can't agree to that, the best i can do is 2water 1 food and 2 firewood for you, i have to have supplies too'
A: 
Yes