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: 'Oh yes, I have my whole family coming. I'm really excited because we don't see each other often. My aunts, uncles, cousins. Some of us will hike while others stay back. Maybe we can come to an agreement? Will you also be hiking?' 'Yes hiking for sure.  If I take 2 firewoods and give you 2 waters and 1 food, would that be acceptable?' 'I think that could work '
Utterance: 'Thank you.  Have a great time and stay safe. It's going to be a blast for sure. '

A: No
****
Q: Context: 'That deal is not favorable for me' 'Feel free to counter, but I'm not loving anything that I've gotten so far.' '1 firewood, 2 water, 1 food for me which should mean we each get 2 priority packs -'
Utterance: 'Feel free to counter, but I haven't liked anything so far.'

A: No
****
Q: Context: 'Water was my high priority and food was your's, so I think we already split the difference there. ' 'Okay, so how do you propose splitting the firewood?' 'Can we split a bundle, in the real world that would be cool.  '
Utterance: 'I wish we could. I would be down for that. 🙂 That seems the most fair to me. How about you enter the trade deal on your end?'

A:
Yes
****