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: 'Well that's interesting because I don't even know what is is.' 'We aren't allowed to submit it just yet. So let's chat. What do you value most among the items?' 'Please don't try to order me around. 😡 I require a majority of water.'
Utterance: 'Let's be reasonable here. If you are nice to me I'll be nice to you. I'll take the majority of the wood and food if you want most water.'
Yes

Context: 'I have 3 kids with me who are always thirsty but we can negotiate for it' 'Ok. Thats fine' 'Oh great 🙂'
Utterance: 'There is really not much option of evenness since its an odd number package.'
Yes

Context: 'I have a medical condition that causes my veins to close up when I get too cold. I will thus need the 3 firewood.' '☹️Oh, that sounds awful. Are you sure you need all three packages of firewood?' 'I might be able to get by with just two... I'm on a diet though, so I don't need as much food.'
Utterance: 'That's a relief. I actually have a friend joining me and they don't have their own food supply. I don't have enough for two people.'

No