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.

Q: Context: 'Yeah, firewood isn't really something that's "essential" I'd have to say. Yeah, you need it, but still.' 'True. 🙂' 'Seems like we'll be struggling to see who gets the firewood most of all haha'
Utterance: 'No, I like a little firewood.'

A: No
****
Q: Context: 'Ya definitely. I need food and firewood most. What do you need?' 'I believe that we have the same priorities.  So we have a large family including children that need the food, but my wife also needs firewood due to poor circulation.  She is susceptible to frost bite and limb loss' 'Okay so how about one of us takes 2 of the food and 1 of the firewood, and the other takes 1 of the food and 2 of the firewood?'
Utterance: 'that sounds fair.  I will take 1 food, 2 firewood, and 2 water, thus giving you 2 food, 1 firewood, 1 water'

A: Yes
****
Q: Context: 'Thats great. Do you have any extra firewood you could trade by any chance?' 'Sure, I want to make sure I have one firewood at a minimum. ' 'What would you want in return?'
Utterance: 'I like to eat.  I think extra food is good.  Are you willing to let me have all three food packs? 🙂'

A:
No
****