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.

Context: 'Let me ask you, do you need food most? If yes, what do you need second most?' 'I would love as much food as is available. I would also appreciate excess firewood, as I get cold.' 'Okay, it seems we both have the same priorities in food most and firewood second most. How about this, you take 2 packages of food, I will take 1. You give me 2 packages of firewood I will give you 1. We will then divide the water. Is that fair?'
Utterance: 'That sounds really fair! 🙂'
Yes

Context: 'I can give you 2 units of water, but I need at least 1. ' 'I also need firewood, I have some health issues.  I need the wood to keep warm at night, and for cooking fish.' 'I can give you 2 units of firewood, but I need at least 1 as well. '
Utterance: 'How much food do you need?'
No

Context: 'I want 2 food' 'My kids need the food. If you allow me to have two food I'll give you all the firewood' 'okay then I'll choose 1 food 3 firewood, and 2 water'
Utterance: 'It's a bit skewed towards you with all those items isn't it? If you want two waters then I'll need 3 food and one water. You can have all 3 firewood'

Yes