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: 'We packed enough water but the kids spilled some so I just wanted to make sure we have additional water in case we run out. But we can do with only 1 water. We do really need the food though ☹️' 'So do I. I'm trying to bulk up because I've been skinny all my life. ☹️ Let me just get one please☹️☹️☹️☹️☹️☹️' 'well we do not want to be unreasonable. How about we take 2 food, 2 water then just in case they can be satisfied with the extra water. In that case you get 1 food, 1 water and all firewood. '
Utterance: 'That is not too fair neither of us need firewood. It would be most fair if you got two of your biggest need and I got two of the others. '

Output: Yes


Input: Consider Input: Context: 'I get it as you need more firewood for the additional package of food.' 'exactly, and forgot some of my extra wood at the house again.' 'Have a nice camping trip 🙂'
Utterance: 'you as well'

Output: No


Input: Consider Input: Context: 'Thank you for the offer on firewood.  I think that sounds fair.  However, I really would like at least 2 waters as well. ' 'Hmm unfortunately I can't budge since I would be accepting less of my top priority item.  It sounds fair to me though; I'd get 5 items in total but less of my top priority and you would get 4 items in total but more of your top priority' 'Well, how about if I take 2 firewoods and all of the food and you can have all of the waters? I have a device that I can make clean water, but will need more calories to do so! 🙂'
Utterance: 'Can't do!  Water is my lowest priority since I already brought iodine drops to purify water myself aha.  I still think it's fair if I get 1 firewood 2 food and 2 water (or if it helps you to feel better, I can take 2 firewood and 1 food and 1 water)'


Output: Yes