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: 'Initially you were willing to take the 2 packages of firewood. If you have all three I won't be able to cook any of this fish and it will all go to waste. ☹️' 'Didn't you bring any firewood at all with you?' 'Yes, but the firewood I have will be used to keep us warm tonight.  Like you mentioned before it will be a bit chilly tonight.'
Utterance: 'Ahh, I forgot about that. OK. I'll take 2 packages of firewood, give you 2 waters, and 1 food packages as you do have some fish to cook and I don't. Do we have a deal?'
[A]: Yes


[Q]: Context: 'Will you give me 2 packages of food and i give you 1 package of water?' 'Hello! I can give you 2 packages of food of you give me 3 packages of water'
Utterance: 'Let me give you 2 packages of water for 3 packages of food.'
[A]: No


[Q]: Context: 'Food doesn't prevent cold. Thank you for giving me all the food but I need 1 wood to cook the additional food. You still end up with more items in the  end  ' 'Okay I accept the deal.' '🙂awesome thank you'
Utterance: 'Sorry, I thought that I can manage with two woods, but the temperature is very loo and many people need to save their life.  Please change the deal and provide us 3 wood.'
[A]:
Yes