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: 'Oh no, I'm so sorry to hear that ☹️ Let me ask about the food first then, would you be willing to give me the 3 packages of that? I am going to have a lot of people with me and we won't be near any stores at all.' 'if i give you all the food items, will you give me the firewood?' 'I was thinking maybe you can have 2 firewood and 3 waters. And I could take 1 firewood and 3 food?'
Utterance: 'that sounds fair'

A: Yes
****
Q: Context: 'Would you be willing to give me 1 food, 2 firewood, and 2 water?' 'I could make that work 🙂 I'm sorry if I came off mean, I'm just trying to make sure I'll be ok. I don't camp often, so I'm not sure how to prepare.' 'I understand. What are you using the extra food for?'
Utterance: 'I brought some pre-packed snacks, and a few sandwiches. I'm hoping there are no hungry animals around. What about you?'

A: No
****
Q: 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'

A:
Yes
****