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.
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Question: Context: 'Thank you for asking, I would really like some extra fire wood as I usually get cold and scared at night so I can keep a fire going.' 'I'd be willing to give you all my firewood if you could give me all the water.' 'I do need at least one extra water bottle in case the fire goes out of control, but I am willing to forgo any food as I can forage for food.'
Utterance: 'Alright. Thanks. I only ask for so much of the water because I am overweight and I know while camping I'll work up a huge sweat.'

Answer: No


Question: Context: 'We likely need a lot of firewood and some water to put out the fire when we are done lol. What are you thinking?' 'Yea, I'm not too into firewood because it will be quite hot when I make my camping trip. I could definitely use some more food just in case of an emergency out there.' 'Then how about I give you all my food in exchange for all the firewood and since I have to put out the fire, maybe 2 water for me and 1 for you?'
Utterance: 'That sounds like a fair deal. I have no problem with that one.'

Answer: Yes


Question: Context: '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.' 'That wouldn't work for me, I will be going hiking during camping, so I need all of the water I can get' 'Well then maybe we can just do a trade, the water to you and the food to me.  And if I got two of the firewood, I'd have plenty of time to just boil and purify some riverwater instead'
Utterance: 'That does not seem entirely fare but I need more water so I will take this deal'

Answer:
Yes