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: 'Who is willing to cooperate in a consensual offer so that we can all get fruitful dividends😡'

Answer: Yes


Question: Context: 
Utterance: 'Hello there! I look forward to striking up a deal that's good for both of us. 🙂'

Answer: Yes


Question: Context: 'Hey, Nice getting to interact with you. I would need additional packages of food as I'm camping with Family and my kids tend to get hungry often.' 'I also have a family I am camping with several small childern and my wife who is pregnant. I need plenty of firewood and water.' 'I get it, in that case and to be a fair deal. I will have 2 of food, 1 of water and firewood each.'
Utterance: 'That seems fair however I would like to have plenty of food also. I think it would be fair to have 2 firewood, 1 food and 2 water '

Answer:
Yes