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: 'So far so good.  What are your plans for your camping trip?' 'yes i guess you too. i will need more supplies like 3 foods, 2 firewood and1 water' 'I have not really camped before so I am looking for as many supplies as possible.  What about I get 3 food, 3 firewood, and 1 water. '
Utterance: 'funnny you but no. so what else will i be left with if i give you those. okay let say i get 2 food, 2 firewood and 1 water.'
Yes

Context: 'How about water? do you need? I can offer 2 of these for 1 pack of food' 'I have plenty of water right now, but need at least 1 pack of food for myself.' 'OK. Do I get the water then? You can at least take a pack'
Utterance: 'Yes, that works for me. 🙂'
No

Context: 
Utterance: 'Hey there how are you?'

No