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: 'That sounds like fun. I checked my list and it looks like I am short on firewood however, would you happen to be able to spare some?' 'Yeah I could supply you extra firewood. I would like some extra food if you could spare that.' 'Yeah I could. How about I get 2 firewood, 1 food, and 2 water. And you can have the rest?'
Utterance: 'Yeah that sounds resonable. I hope you can have fun on your trip.🙂'
[EX A]: Yes

[EX Q]: Context: 'That sounds good to me.  What about the food?' 'I would like 2 food, but you may have one. I wouldn't want you to be too hungry!' 'I don't want to be too hungry either but I think perhaps I might need an extra water to compensate for the lack of food.'
Utterance: 'Since I am giving you all of the firewood that you said was most important to you, I feel I should get at least the same amount of items as you, especially since you are getting exactly the firewood you want. I will need to stick to three waters and two food.'
[EX A]: Yes

[EX Q]: Context: 'Ok great, are you going to be ok with getting your own water and firewood during the trip?' 'I think that I will be able to, so I'd like to offer you those extras.🙂' 'Thank you, it would have been difficult for me to get more firewood and I appreciate the additional water. So I get 3 firewood, 2 water and 0 food.'
Utterance: 'Yes, I think that deal will be the most helpful to both of us. I appreciate the food, which is important to me.'
[EX A]:
Yes