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: 'Hi, what is your highest priority item?' 'I would love to have extra food for my trip, bringing the family! how about you?'
Utterance: 'I agree, it will be tricky to find extra food while camping. I'm sure we can figure out something that works for both of us... the water is also very important to me because it's supposed to be hot. There is plenty of wood where I'm going, so you can have the firewood. Would you be willing to take 3 firewood, 1 food and 1 food?'
Yes

Context: '😮 Food is #1 for me as well! What a pickle. My #2 is Firewood and my #3 is Water. We can split the Food and divided the Firewood and Food based on how important they are to us.' 'True we can , I'd be willing to just take one of the foods if you'd be willing to do that ? Then we can decide on the others ' '🙂v it sound's like we're on the right track! I'll gladly take 2 Food. How would you feel about taking all of the Water, while I take all of the Firewood?'
Utterance: 'Not really liking that , but I'd be willing to split the water with you if I could take 2 of those 🙂'
Yes

Context: 'I would need 2 out of 3 as well.' 'Interesting - you're essentially saying that you need the majority of two of the three items. Hmm...' 'Yes, thats all. I need 1/3 food, 2/3 water, and 2/3 firewood.'
Utterance: 'Still not convinced in any way that you need more items in total over me. Please clarify!'

Yes