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: 'We need a moderate amount of everything and I think we can work something out successfully.' 'got it, OK I'll start then. I'd like at least 2 firewood' 'Okay. we brought some of our own food so I don't need much of that either.'
Utterance: 'do you want more water then? perhaps 2?'
[EX A]: No

[EX Q]: Context: 'I was going to say, the fire would be probably one of the few things I would be interested in! I love being warm.' 'Well you can take all the firewood if it will help, would it be ok if i get all the food in return?' 'That works for me. How would you like to divide the water?'
Utterance: 'I am ok with you taking two waters since you are new to camping, does that seem fair to you?'
[EX A]: Yes

[EX Q]: Context: 'HI, I will have all of the packages of food and 2 waters and 2 firewood and you can have the rest. Unless none is needed for you then I will take them all.' 'i will need 3 firewood packets. I have a terrible disease that prevents my circulation from working properly.' 'That does sound bad. I am going camping and my kids might want to stay up late so I will need extra firewood for this to keep light and more warmth. I will take all 3 extra of the food and the water but I need 2 firewood also.'
Utterance: 'no that won't work. I will give you 3 food and 1 water. I will take 3 wood and 2 waters.'
[EX A]:
Yes