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: 'hello' 'hi'
Utterance: 'In this extra package I need two food'
No

Context: 'Agreed! I am running low on firewood, unfortunately, which I need to cook food and stay warm. ' 'Oh no! That's unfortunate! Luckily, I think I have plenty of Firewood for myself so I think it would be okay for you to have more of that if needed. I don't know if I have enough food. I love to snack all day!' 'That's awesome! And oh no! I have a medium amount of food so we can work that out! How are you doing on water?'
Utterance: 'I have a medium amount of water so I would like some more. I wish we had lots of supplies to split up evenly but I'm sure we can work it out🙂'
Yes

Context: 'How much food do you need?' 'If you give me 1 unit each of water and firewood, I'll give you 2 units of food for helping me out' 'I may need two food, I don't know how much fish I can catch.'
Utterance: 'I can give you 2 of everything, but I want and need at least one of everything so my dog and I can be ok during the winter trip'

Yes