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: Consider Input: Context: 'Hm. Getting warmer. What do you need the most of? ' 'I need more water than the other options, you can keep 2 food and 2 firewood but 1 water' 'I also feel that water is the most important. How about I take all 3 water, and you can take 2 firewood, and 2 foods?'
Utterance: 'I think the fairest thing would be that you keep 1 water, 2 food, 2 firewood'

Output: Yes


Input: Consider Input: Context: 'Sure. 🙂 I'd like to take 2 waters for my hike and 2 food for my get-together later. You would have 3 firewood, 1 water and 1 food. Sounds like a good compromise to me!' 'That sounds great. 🙂' 'I hope you have a use for all of the wood! What do you plan on using it for?'
Utterance: 'I am going to cook fish that i catch and boil any extra water I can find. '

Output: No


Input: Consider Input: Context: 'I can share water for firewood.' 'Optimally, I would like 3 food and 2 water which would leave you with 0 food, 1 water and 3 firewood. I think it will be easier if you also tell me your optimal wants then we can go from there.' 'We could each keep 3 food.'
Utterance: 'No, that won't work. There is only 3 total of food, water and firewood each.'


Output: Yes