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: 'I have plenty of firewood.  I need two pieces of food though for my hiking.  ' 'one piece wouldn't be enough? i will give all the water' 'Nope, I need two.  I can give you all of the firewood. '
Utterance: 'all the firewood and one food then, not ideal but i can work with that.'
[A]: Yes


[Q]: Context: 'I would need 2 food if you keep all the firewood. It would make it easier on me cooking wise since I'll have to look for wood' 'OK, that is fair.  So I would get 3 firewood, 1 water and 1 food and you would get 0 firewood, 2 food and 2 water.' 'I think that sounds fair to me'
Utterance: 'Sounds fair to me too. do we agree to submit the deal?'
[A]: Yes


[Q]: Context: 
Utterance: 'Hi, I would like to get firewood because I would like to sit by the campfire in the evening.'
[A]:
No