TASK DEFINITION: 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.
PROBLEM: Context: 'I would do 3 firewood, 2 water and 2 food.' 'I can't do that. Truth is I need the firewood and I was hoping you didn't need it. I propose I keep 1 firewood, 3 waters and 2 food and you take the rest?' 'I would do this instead: 3 firewood, 1 water and 2 food.'
Utterance: 'That's not going to be a fair offer, you'll need to do better than that or I don't think we can come to an agreement'

SOLUTION: Yes

PROBLEM: Context: 'I also need water.  You would not believe how much my family and I sweat!' 'I understand. I am unfortunately sick and need the warmth of the fire and water to take my medication or I will die very soon' 'You can have all of the firewood, we just need 1 water '
Utterance: 'That is fair. Could I also have 1 food so I do not starve'

SOLUTION: Yes

PROBLEM: Context: 'Hi there, I hope I would be able to leave with some needed items'
Utterance: 'Likewise! What are you in need of'

SOLUTION:
No