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: 'I understand your preferences. If I take all of the water, 1 firewood, and 2 food your family will still have the opportunity to have a good camping trip and I can learn to survive on this trip. Please consider my request again.☹️' 'Ok - you're not being reasonable at all.  If you're so incompetent at going camping, maybe you should stay home and I can take all the supplies. How's that for an excellent offer?  All for me and 0 for you.' 'I think it would be good to come to a compromise. If I take all of the water and have the 2 foods, you can take all of the firewood as you originally proposed. Yet, I will have a tough time learning how to survive on a camping trip.😡'
Utterance: 'Again, that's not a fair compromise....You get all of what we both we want and more of another item.  Let me state it to you clearly so you can understand.  I WILL NOT ACCEPT THAT OFFER.  There is no chance you are getting all the water now that I think about it.  I will offer I get 1 water, 2 firewood, and 2 food.  If you can't come up with a reasonable offer, I will just walk away and we both get nothing.  I will survive because I will have skills.'
Yes

Context: 'Hello, I'd like to get all of the water, an extra firewood and 2 of the food' 'Hi there.  That hardly leaves me with anything and doesn't really work for me.  I was hoping to make a campsite feast and get the extra food.  If we can do that, I'd be happy to give you all the water and that extra firewood.' 'I am a big guy, so I will need some more food, how about you give me an extra food while you hold on to two'
Utterance: 'I can't give you all the water if you take one of the food, I'm very sorry.  I could take 2 of the food and 2 of the water if we do it that way.  I really need cooking supplies if I want this trip to be productive for me - it's why I was coming.'
Yes

Context: 'Hi there, i appreciate your initial offer. ' 'What is your offer on the additional packages?' 'I would be willing to give you all of the firewood (3) and two of the water (2) while I get the rest'
Utterance: 'Ok great, are you going to be ok with getting your own water and firewood during the trip?'

No