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.

Context: 'Hey, I was thinking that I could take all of the food items, and 2 of the firewood items. My friend has low blood sugar and they need the food in case they crash, and the warmth of the fire to maintain at evening.' 'Water is my highest priority, what is yours? Is it food?' 'Yes, food is my highest. It's necessary for my friend to keep extra around just in case he crashes. Why is water your highest priority?'
Utterance: 'I need the water to drink - I don't trust the water I might find at the campsite.'
No

Context: 
Utterance: 'Looking forward to this camping trip!  I am hoping we can find something amicable with these additional resources.'
No

Context: 'Right...hmm. What do you say to 2 food, 1 firewood for me?' 'i am good with that how many waters do you want can i have 2?' 'Sure we can do that 🙂'
Utterance: 'ok so i get 1 food 2 firewood and 2 water? sound fair?'

Yes