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: 'I understand. We are also planning a campfire, and have a lot of young kids who will need the fire to stay warm. So that's why I feel I need two firewoods. 🙂' 'Sorry for apologize. Here we are having old aged people here. I need two packages of food. Otherwise two of firewood.🙂' 'I understand. I am willing to give you two packages of food if I can have two firewoods. I would also like two waters due to it being hot out for our hike. 🙂'
Utterance: 'Okay. I think it will be good. Then I'll take two packages of food one of  firewood and one of water.🙂🙂'

No