Definition: 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.
Input: Context: 'Ii understand , the problem  is ctheere is 3 of us. What if  we have 2 food and 2 water and you have 2 firewood ?🙂' '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🙂' '(sorry for the misspellings on above post, my keyboard does that) Ok since that  is your highest priority , I have 2 food 1 water and 2 firewood ? Is that agreeable ?🙂'
Utterance: 'What do you think about this offer, I will give you 2 of FOOD since it is what you need the most, 1 of WATER since it is what I need and 2 of WOOD, I will have less wood but we will both be satisfied.'

Yes