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.
Input: Context: 'So, it looks like we have reached a compromise. ' 'Yes we have. Just to clarify, I will get two packages of water and you will get one. I will also get two packages of firewood and you will get 1. And then I will get 1 package of firewood and you will get 2,' 'I will get two packages of food and you will receive one. I will get one jug of water and you will receive two. I will get one bundle of firewood and you will receive two.'
Utterance: 'Perfect. It has been a pleasure negotiating!'

No