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: 'so water, firewood and food for you, and water food and firewood for me. what do you suggest' 'I'm not much of a food fan knowing that without firewood you die of hypothermia if wet, one can survive without food/ with little food for months' 'so let's do this quick, how about 2 water for you, 1 water for me, 0 food for you, 3 food for me'
Utterance: 'good excellent choice'
[A]: No


[Q]: Context: 'Well I am happy to give you all my food in exchange for all your water.' 'We can do that! How do you want to split up the firewood?' 'It's an odd number so someone has to get 2. But in order to make it fair if one of us takes two then the other should get one of the lower priority items. What do you think?'
Utterance: 'That sounds fair to me! I am good either way.'
[A]: Yes


[Q]: Context: 'I'm not familiar with my surroundings. None of us going have ever been to this spot.' 'I mean I would give two waters if I could get one more food. So 2 water for you and 2 food.' 'I'd like to keep all the firewood if I'm giving the majority of the water.'
Utterance: 'Ok, that seems fair.'
[A]:
Yes