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 hood to see a fellow camper. How are you doing today?🙂' 'Hey! I'm doing great, how are you? ' 'Looking forward to doing some serious hiking with the family. bad luck on the way here we flew in and the airline loss or bags with some of our supplies and sleeping bags.☹️'
Utterance: 'oh nooo, that's terrible. do they know where they left them?'
No