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.

[EX Q]: Context: 'I love camping also!  Yes, I can see how you would need firewood if you want to cook your food.  So, food is more important to you than water?' 'Yes, I will need a little water to wash that food down with though. Are you going to be needing a lot of water?' 'Yes, I may need more water.  I am on a diet and I don't really cook either!  Hopefully we can work something out here.'
Utterance: 'That sounds great. I probably need to go on a diet, but I like my food to much. LOL'
[EX A]: No

[EX Q]: Context: 'Hello! Which item do you need the most?' 'I would love to have the Firewood the most. ' 'Unfortunately I need firewood the most too. How about I take 2 firewood, 2 food, and 1 water?'
Utterance: 'I feel that I am not getting a fair deal. '
[EX A]: Yes

[EX Q]: Context: 'I really don't want to be without water, how about 2 water and 2 firewood for the 3 packages of food?' 'I just want to make sure I understand you I get 2 waters and 2 firewood and 0 food. ' 'That's right. Since you would be getting food from your sister, while I am camping alone, you would be getting more food pretty soon. '
Utterance: 'umm. I think the best and fair deal is a complete swap of water for food and you get 2 fire wood. '
[EX A]:
Yes