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.

Context: 'Well I have to have some food and I don't need all of that water.  How about I take 2 water, 1 firewood, and 1 food.  I do need the firewood to cook the fish but I dont need it to keep warm at night because I have hefty sleeping bags that work excellent in the cold.' 'That could work, but I'm still a little worried I won't have enough food for 6 people. How long are you guys going to be camping for?' 'I will be camping for 3 day so I gotta have some food.  Although, I do understand your situation.'
Utterance: 'I see. Yeah, if any of us knew how to fish or forage, we wouldn't need as much, but we're all from the city, so our survival skills are pretty bad and we're going to be camping for almost a week. But I get that fish aren't super reliable for food either... ☹️'
No

Context: 'Hi how are you?' 'I am good. How are You.   I was just thinking about how I need extra water due to a medical condition.  How about I take all 3 waters?' 'I am okay. How about I give you one and half then I get some firewood from you?'
Utterance: 'No I need at least 2 waters.  But I am willing to give you all 3 foods, if I get all the firewood.  Does that work for you?'
Yes

Context: 'Food is also my highest priority, but firewood is also pretty close for me.' 'Would you be willing to take more firewood for less food?' 'Yes I think that sounds fair.'
Utterance: 'So if I take 2 foods and 1 firewood, you take 1 food and 2 firewood. What would be fair for water?'

Yes