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.
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Question: Context: 
Utterance: 'Hello'

Answer: No


Question: Context: 'Sure, my number one item if food if you can spare any.' 'It'd be nice if we can both get an even split right?' 'Well some needs are higher than others.  I need more food but I can give up some firewood or water.'
Utterance: 'I think we can start off with 3 water for me and 3 food for you'

Answer: No


Question: Context: 'But you get everything you wanted. You said you needed 3 water, I offered it to you.' 'but i can't give you 3 food and 3 firewood, thats 6 items vs the 3 water' 'Sure you can.  If you really want water the most, why would you care about the rest as much?😮'
Utterance: 'most does not mean i have to neglect the rest, anyways either a) I get 3 water, 2 food and 0 firewood or b) I get 1 water, 2 food and 2 firewood'

Answer:
Yes