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: 'That sounds reasonable. I don't particularly need the food because I see that as more of a luxury but I could really use some more water. It's supposed to get really really hot on the weekend. 😮' 'I hear that. What do you think of if I take 3 of the food supplies and you can have two waters? ' 'That sounds like a fair compromise. I can get food by hunting animals, old school style. That would give you 4 total items. In that case it's only fair if I take all 3 of the firewood. 4 for me and 4 for you sounds like a good deal to me. 🙂'
Utterance: 'That sounds fair to me! I don't know the first thing about hunting so that would be a relief on me. We took a bunch of blankets so we'll be good on firewood.  🙂'
[A]: Yes


[Q]: Context: 
Utterance: 'I will submit a deal that might benefit us both.  '
[A]: Yes


[Q]: Context: 'Hello! Hope your after noon is going well! I have 2 kids so I feel like the water is the most important for them. Need to keep they hydrated, ya know? 🙂' 'I also need water with my medical condition I have to take lots of meds. I can give you extra firewood so you can boil more water easily.' 'Dang. I'm sorry for your condition. I really don't need the firewood though as I cut so much this year.. How can we negotiate? I'd hate for something to happen to you.'
Utterance: 'We can try to figure out a way to split the water and food in the fairest way 🙂. Firewood isn't an issue so it doesn't matter as much. I think to start something like splitting the food 2/1 and the water 1/2?'
[A]:
Yes