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: 'how much firewood do you need' 'I would like 2' 'I will  be happy to let you have 3 packs of food , but I need 2 packs of firewood'
Utterance: 'I am also letting you have all 3 packs of water. I think we need to consider how to split the firewood in a fair manner.'
Yes

Context: 'Hello I'm really hungry and thirsty and want some food and water if that's ok with you. '
Utterance: 'Well some is okay but not all. The thing is that we left in a hurry and forgot to pick up the bag with the extra food items. I am sorry but we have kids with us so we will need the food. Am sure you understand ☹️'
Yes

Context: 'Then i understand, i have kidney issues but i would rather go without then take away from a family' 'If you need water for a medical issue the of course you can have two waters.' 'You are being very kind then, im elderly so trying to make fresh water by boiling it from getting it from a river was concerning to me. How about you take all three of the food for your kiddo's'
Utterance: 'That sounds fair. The kids can bathe in the stream. We are good with 2 food packs.'

Yes