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: 'i need food the most since there will be my kids and I. I can give up my firewood for food' 'Okay, so how about I get 1 food, and 3 firewood and 1 water, and you get 2 food, 0 firewood, and 2 water' 'sounds great'
Utterance: 'great! sounds good to me'
[A]: No


[Q]: Context: 'That sounds like so much fun!  I hope we get to hike some.  I have my four month old baby with us which is exciting.  I'm worried I didn't bring enough water for his bottles, though.' 'That sucks, you need to be hydrated. What supplies do you require? My family loves to grill, so we do require food.' 'Grilling is so much fun!  We left our grill at home so we can't really do that.  I will trade you some food for some water if you would like?'
Utterance: 'sure that sounds fair'
[A]: Yes


[Q]: Context: 'Can I have 2 of firewood in that case, as I have food that needs to be cooked and would be a great help.' 'Can I have 2 firewood 2 food and 1 water I think this would be enough' 'I have a Family too, I can compromise on either only one of Firewood or Food, please give a thought.'
Utterance: 'This is way too unfair, my friend'
[A]:
Yes