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.

Ex Input:
Context: 
Utterance: 'Who is willing to cooperate in a consensual offer so that we can all get fruitful dividends😡'

Ex Output:
Yes


Ex Input:
Context: 'oh it turns out I need firewood too!🙂' 'Ha what a surprise! ;-) What do you need second most?' 'I need food to feed all my friends that are coming up. how about you?'
Utterance: 'Haha yup me too. I have a teenage son who eats about 5000 calories a day. Okay, I think the most fair option is one of takes 2 firewood and 1 of the other two items. I don't care who.'

Ex Output:
Yes


Ex Input:
Context: 'thats the point as you need water so badly' 'Correct.. I do.. but if you're not willing to budge on this where you're still netting more overall value I understand - I'm bummed but I understand.' 'im contented with  what i have but im willing to trade as yu need more water so i need t make a profit'
Utterance: 'That's unfortunate then as instead of making a tiny bit less of a profit now you're not going to make any because you would rather give up the deal.  Also, if you do the math, you'll see that I'm actually benefiting you here - I understand, though.  I can put through the offer and hope you change your mind so we both benefit.'

Ex Output:

Yes