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.

[Q]: Context: 'yeah we got a lot of things planned for them at the campgrounds. they're going to be pretty busy' 'So what is your main focus this trip?' 'one of my kids is on medication so we are going to need to pack a lot of water. so if could spare that it would be appreciated.'
Utterance: 'Well sadly I plan to go hiking a lot so I will need lots of water, but perhaps we can come to a reasonable agreement if I have to shorten my hikes.'
[A]: Yes


[Q]: Context: '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' '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.'
Utterance: 'That wouldn't work for me, I will be going hiking during camping, so I need all of the water I can get'
[A]: Yes


[Q]: Context: 'That is so nice of you. Being that you have family, you might need more firewood for cooking for the crew! Do you agree? And how many kids are you traveling with? ' 'I have 2 kids and want to make sure they stay warm.  The firewood will go a long way in keeping them comfortable.' 'I am leaving my little ones home. I feel a little guilty but am going forward with the plan! So, I input our order that you guys receive 3 food, 2 firewood, and no water. Are we in agreement?'
Utterance: 'Yes. That sounds fair to me.'
[A]:
Yes