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: 'Unfortunately it is impossible as we are already on site compared to you about to head out. ' 'I see. You are a victim of poor planning. Whereas the refugees I attend to are the victims of greed, malice and human suffering. What are you proposing?' 'How about I take 2 packs of water, 2 packs of food and 1 firewood'
Utterance: 'Impossible. I will need to cancel the trip altogether.'
[EX A]: Yes

[EX Q]: Context: 'How many persons are you feeding? I am feeding 2 adults and 2 children.' '2 adults and 3 children, so if I get 2 food and 1 water, you could get 1 food and 2 water? ' 'I believe we can work with 1 food and 2 waters.🙂'
Utterance: 'So 1 package of firewood, 2 food and 1 water for me and 2 packages of  firewood, 1 food and 2 waters for you? Sound good? '
[EX A]: Yes

[EX Q]: Context: 
Utterance: 'Hey! For the camping trip it would be awesome if I could have 3 packages of food. My friend is gluten and dairy free and we need as many options as possible for her. '
[EX A]:
No