TASK DEFINITION: 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.
PROBLEM: Context: 'I am thinking I will want food most'
Utterance: 'Great! Food is not my priority but water and food is.'

SOLUTION: No

PROBLEM: Context: 'Hello there. I'd like to discuss making a deal.'
Utterance: 'yes, what would you like?'

SOLUTION: No

PROBLEM: Context: 'Yes, I think we can. I'm thinking 3 water, 2 food and 1 firewood for myself? How does that sound to you?' 'i can't agree to that, the best i can do is 2water 1 food and 2 firewood for you, i have to have supplies too' 'Could I trade one firewood for another food?'
Utterance: 'no, food is the top priority for me'

SOLUTION:
Yes