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 don't think I will be able to give you 2 waters. I'm desperate. I need at least 2. I would give you 1 if I could get 3 packages of food. I would give you all the firewood. ' 'If i give you 3 packages of food then i will take 3 packages of firewood.' 'So I get 2 waters and 3 foods. and you get the rest?'
Utterance: 'I could use one food too. How am i going to survive without eating anything?'
Yes

Context: 'I am just going to walk away,  I can't have my family freeze' 'I do not want my family to freeze either but walking away doesn't benefit either of us. How about I take the water and 2 firewoods, you have the rest' 'No deal, I need at least 2 firewood'
Utterance: 'Ok, I can agree to 2 firewood but I will have to take all the food and water to compensate'
Yes

Context: 'I also need 2 pieces of firewood' 'That's unfortunate. I cannot agree to a deal without 2 pieces of firewood. I would have to walk away, but that would bee worse for both of us.' 'okay fine. will you give additional water?'
Utterance: 'Yes, that would work out. '

No