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: 'That sounds like so much fun! I hope we get to hike some. I have my four month old baby with us which is exciting. I'm worried I didn't bring enough water for his bottles, though.' 'That sucks, you need to be hydrated. What supplies do you require? My family loves to grill, so we do require food.' 'Grilling is so much fun! We left our grill at home so we can't really do that. I will trade you some food for some water if you would like?'
Utterance: 'sure that sounds fair'
Yes

Context: 'Okay, maybe we can split the water and then divy up the rest. What else are you interested in?' 'I was hoping for a decent amount of food, just in case my new recipes don't work out, lol. 🙂' 'Haha, makes sense. I'm also interested in food. What if I take 2 waters and 1 food, and you take 1 water and 2 food?'
Utterance: 'I would be okay with that if I could also have all of the firewood. It seems fair since you will be getting the most water. Would that work for you?'
Yes

Context: 'im only require so much as im one person. you will double that' 'hey buddy I hope we both end up with a good deal🙂'
Utterance: 'i think its fair, do you, i think anything extra at this point in time is better than having nothing'
Yes