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: Consider Input: Context: 'I do not want my family to freeze either but walking away doesn't benefit either of us. How about I take the water and 2 firewoods, you have the rest' 'No deal, I need at least 2 firewood' 'Ok, I can agree to 2 firewood but I will have to take all the food and water to compensate'
Utterance: 'I am walking away, completely unfair'

Output: Yes


Input: Consider Input: Context: 'can i have 2 foods too' 'If I can have all the firewood...' 'i am giving you one firewood'
Utterance: 'That doesn't work for me. I propose you get 2 water and one firewood and 2 food.'

Output: Yes


Input: Consider Input: Context: 'That sounds like a deal, what would you like to do as far as the firewood goes?' 'I really need to keep warm with my not so good sleeping bag.☹️ I would be willing to do this. I get two packages of firewood and three packages of water and I will give you two packages of food and one package of firewood. You have plenty of water so you will not miss that.. ' 'This sounds good to me, unless you would be able to part with three packages of food?'
Utterance: 'No, I would like to keep one for me just in case I need it. If it sounds good to you can we finalize the agreement and move on. I think we have something that helps us both.🙂'


Output: Yes