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: 'Looks like we both really need the food.  If you get 2 food I would need 1 food, 2 water and 3 firewood. ' 'Since you will get all the fire would do you think I could have 2 foods and 2 waters. You would get 1 food, 1 water, and 3 firewood. 🙂 You seem like you are a great outdoor person that I would think you would be able to catch some fish to cook with the firewood. 🙂' 'No that does work well for me.  If I only have 1 food I need 2 waters and the firewood to make up for the loss of food.'
Utterance: 'What about I have all the food, and you can have everything else? I would think that seems pretty fair.'

Ex Output:
Yes


Ex Input:
Context: 'Firewood is not overly interesting to me, but water is somewhat enticing.' 'Ok, great - I can give you all of my waters in exchange for a majority of the food and half of firewood' 'Half of firewood? There are 3 so one of us has to get more. I would need more of that. '
Utterance: 'Yep, I know there's three and no way to split evenly lol - can you give me a justifiable reason as to why you deserve more over me? Please convince me.'

Ex Output:
Yes


Ex Input:
Context: 'If you make it two food, we have a deal.' 'I would rather let you have the third water than other food. I don't like fish. ☹️' 'Okay, you can have two firewood and and two food, I'll take the rest.'
Utterance: 'Ok. That seems fair enough to me.'

Ex Output:

Yes