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: 'but i can't give you 3 food and 3 firewood, thats 6 items vs the 3 water' 'Sure you can. If you really want water the most, why would you care about the rest as much?😮' 'most does not mean i have to neglect the rest, anyways either a) I get 3 water, 2 food and 0 firewood or b) I get 1 water, 2 food and 2 firewood'
Utterance: 'That is simply unacceptable.'
[A]: Yes

[Q]: Context: 'oh it turns out I need firewood too!🙂' 'Ha what a surprise! ;-) What do you need second most?' 'I need food to feed all my friends that are coming up. how about you?'
Utterance: 'Haha yup me too. I have a teenage son who eats about 5000 calories a day. Okay, I think the most fair option is one of takes 2 firewood and 1 of the other two items. I don't care who.'
[A]: Yes

[Q]: Context: 'We will have 50 adults with us. How about 2 firewood, 1 food, 1 water for you?🙂' 'lots of work for the both of us, at least you will have lots of help on you end. I accept the 2 firewood specially if you have elderly with you. will you be okay if give me 2 foods? ' 'True, 2 firewood and 2 food for you and I'll take 3 waters.'
Utterance: 'that sounds perfect! thank you so much for understand and wish me luck with all of the little rascals im taking. to verify, I will be taking 2 FW, 2 Foods and 0 waters'
[A]:
No