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.

[EX Q]: Context: 'I don't need the water as much.  How about I get 2 firewood and you get 2 water?' 'I would prefer all the water. You can have all of the firewood.' 'That sounds good to me.  What about the food?'
Utterance: 'I would like 2 food, but you may have one. I wouldn't want you to be too hungry!'
[EX A]: Yes

[EX Q]: Context: 'Well I was thinking you could get all the extra firewood and work on the group meal and bonfire for friday night' 'I like the sound of getting the firewood, but I can't just accept no food or water.' 'I'll give you one of the extra food so you have a little extra to cook for everyone but I'm really gonna need all that extra water, it's going to be really hot this weekend and the folks at the capsite get to sit in the shade all day'
Utterance: 'Now we are making progress. But come on, I will need at least one water to make sure I'm hydrated. I wouldn't want to get heatstroke out in the woods.'
[EX A]: No

[EX Q]: Context: 'Wow. Thank you. Ok. Then I will give you all 3 firewood, however I need all food package with water.' 'How about I get 3 firewood, and you get 2 food AND water? We both win with that, I think.' 'So now you need 3 firewood with 1 food. Am I correct?🙂'
Utterance: 'Yes, that sounds fair to me. Although I would be willing to take a water if you're offering it, I am not quite as lucky with water. ☹️'
[EX A]:
Yes