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.

Input: Consider Input: 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'

Output: Yes


Input: Consider Input: Context: 'Thats what I wanted, but wait , I just remember that I have to stay a bit longer at the camp . why don't you let me have 3 on food, 2 on firewood and you van have all the water and ' 'ok, your being greedy but lets make the deal' 'hahahah not too greedy, but yes we can make a deal🙂'
Utterance: 'you gave me one on each, thats unfair man!'

Output: Yes


Input: Consider Input: Context: 'If I take 2 waters, will you accept 2 firewood?' 'You take 2 waters, I'll take 2 firewood and 2 food?' 'What about you take 1 water and the firewood.  I take 2 waters and all the food'
Utterance: 'That leaves me with very little. Can I have 1 water, 2 firewood, and 2 food?'


Output: Yes