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: 'one food, three wood.' 'bro it is not a fair deal give me 2 food, one firewood 2 water' 'if you think I am not being fair can I have what you are asking for?'
Utterance: 'you told me i not fair that why i told you are not fare,3 food for me  will give 3 firewood for me, give 2 water for me, other we can end the deal and both we can forget the bonus'
Yes

Context: 'Good morning' 'Hi, how goes it?' 'It's going alright. What do you need the most to trade?'
Utterance: 'well, I run and could use some extra water. How about you?'
No

Context: 'We cannot budge at all on food. But are more then happy to give up all the extra fire wood for all the food. ' 'Could you trade one food item for either one firewood or water?' 'How about this- You will get 1 food, 1 water and 3 Firewood. I will get 2 Food and 2 Water with 0 Firewood. '
Utterance: 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.'

No