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.
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Question: Context: 
Utterance: 'I think we'll both need each of the three items, but we can't split them evenly. How about I take 2 waters, 2 firewoods, and a food. You can have two food packages, a water, and a firewood.'

Answer: Yes


Question: Context: 'My main objective for the camp is food and firewood, since I have a large family and the amount of food they give in the camp is very small for all my family and my wife and I have to cook with firewood in the camp.' 'I understand completely. I would like to have all three water, and I'm only traveling with just me, so how about 1 firewood? The rest for you.' 'No me gusta mucho el trato, pero para eso debemos hablar y decidir como adultos un buen trato para los dos. Lo que queremos es disfrutar en el campamento.'
Utterance: 'I do not understand spanish. Please speak to me in English.'

Answer: No


Question: Context: 'Okay, but water is important to me because I have health issues. So I drink more water for save my health.' 'Okay! You can have all the water. I want all the food.' 'yeah sure, I will share with you all the food. What is about firewood?'
Utterance: 'You can have two if I can have one if you're okay with that.'

Answer:
Yes