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: 'brother k , bro 2 water and 2 wire wood 1 firewood can you given?' 'I think that that is acceptable to me. I want to make sure we both understand: I get 1 Water, 2 Firewood, 2 Food Packages. You get 2 Waters, 1 Firewood, 1 Food Package. I will have to ration my water, but I think the extra comfort is worth it. Does this work for you? ' 'bro its not profitable ratiobro gave 3 water 1 firewood, remaning you can take'
Utterance: 'Won't you feel hungry? I'll accept that deal if we can exchange one water for one food package. That still leaves you with two waters. I think that's the least I'm willing to accept.'
[A]: Yes

[Q]: Context: 'Yes, I expect that! You need food most and I need water, so let's propose an exact trade? 3 for 3?' 'My main objective for the camp is food and firewood, since I have a large family and the amount of food they give in the camp is very small for all my family and my wife and I have to cook with firewood in the camp.' 'I understand completely. I would like to have all three water, and I'm only traveling with just me, so how about 1 firewood? The rest for you.'
Utterance: 'No me gusta mucho el trato, pero para eso debemos hablar y decidir como adultos un buen trato para los dos. Lo que queremos es disfrutar en el campamento.'
[A]: Yes

[Q]: Context: 'Most needed is both food and water. I guess food is my highest priority .🙂' 'Ok perfect, the item I need the most is water because I need to hydrate. What do you think if I give you 2 food and I keep 2 of water. ' 'Ii understand , the problem is ctheere is 3 of us. What if we have 2 food and 2 water and you have 2 firewood ?🙂'
Utterance: 'The object I need the most is WATER, so I cannot give you 2, I am giving you 2 FOOD since it is what you most need. Remember that we must both be satisfied for this to work🙂'
[A]:
Yes