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: 'This offer is good for me but I need some water too. Can we share the water and have all the firewood? 🙂' 'No, I offer you 3 food, and 1 water.  I would like 2 water and 3 firewood.' 'Well this is perfect for me. I agree with 3 food and 1 water. Do you also agree?🙂'
Utterance: 'Sure that sounds fair to me, we both get what we need.🙂'
A: 
Yes