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: 'I would like a little extra food for myself as well. Would you be willing to split the food 1 for me and 2 for you? ' 'I'd be willing to do that if you gave me some water and firewood in exchange' 'How about I keep 2 firewood, you take 1? What do you propose for the water?'
Utterance: '1 food for 1 firewood isn't a good trade for me. I would need at least 1 firewood and 1 water to trade for 1 food.'
Yes

Context: 'Hello! how are you doing?' 'Hello, I would like to keep the 3 extra packages of firewood an 2 extra packages of water. You can have all 3 packages of water and 1 package of food.' 'That's just too big of an ask. How about I get 3 firewood and 1 water and you can have the rest'
Utterance: 'I really need the extra firewood. I hiked 5 miles o this camping spot and I need the extra firewood to stay warm and to keep the wild animals away at night.'
No

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?'
Yes