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: 'Hello, I'm excited for our camping trip!' 'Hey buddy, yes I'm so pumped for it.' 'Okay so I'm planning this super cool backpacking expedition up the waterfall but I'm going to need all the additional water and food for everyone.'
Utterance: 'All of the additional water and food? That doesn't seem very fair. ☹️'

Answer: Yes


Question: Context: 'I prefer to have the most water as I have a medical condition that requires me to stay extremely hydrated at all times. If I get too dehydrated, it's extremely bad for me. How about I get 3 water and 1 food, and 2 firewood?' 'I'll give you the 3 water, 1 firewood. How about I get 3 food and 2 firewood? I'll need the fire to cook my food.' 'I would need firewood to cook my food as well. I would like the 3 water, 1 food, and 1 firewood, what about that? '
Utterance: 'Since the value of water exceeds both food & firewood, I think it's fair for me to receive the extra dose of firewood. My offer to you is: you get 3 water, 1 food,  0 firewood.  I would get 0 water, 2 food, 3 firewood.'

Answer: Yes


Question: Context: 
Utterance: 'I'd like to have 2 extra packages of water and firewood.'

Answer:
No