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: 'Hello there. I'd like to discuss making a deal.' 'yes, what would you like?' 'I was thinking I will take all the food and water. You can have the firewood. '
Utterance: 'that's not going to work for me. I need to keep at least 2 foods and 1 firewood but you can have all the water.'

SOLUTION: Yes

PROBLEM: Context: 'Could you trade one food item for either one firewood or water?' 'How about this- You will get 1 food, 1 water and 3 Firewood. I will get 2 Food and 2 Water with 0 Firewood. ' 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.'
Utterance: 'Hmmm i don't beleive i ever offered you everything for all the food. I will need at least one water. lets not be selfish.'

SOLUTION: Yes

PROBLEM: Context: 'ah, I'm definitely ok with doing one at a time: A 2:1 split is definitely OK with me: The issue is, if we consider each individually, it might be harder to come to a deal, but I'm happy to do it your way.' 'How about you take 1 firewood, I''l take 2 and with food, you can have 2 and I'll take one package.  I have two very hungry boys!' 'Is there a reason you want the 2:1 split? Food my group's largest priority by a large margin (We eat a lot). It's worth a lot more to my group then the firewood would be.'
Utterance: 'That's why I would like to give you 2 and I will take 1 food.  I have 8 and 10 year old boys.🙂'

SOLUTION:
Yes