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.

[EX Q]: Context: 'I'm doing well. I'm very excited about our camping trip!' 'I am too! I have a rather large family and we are looking forward to getting out for some time away!' 'How nice. I am bringing my daughter and her girl scout troop. I am the co leader.'
Utterance: 'Oh that'
[EX A]: No

[EX Q]: Context: ' I would agree to that if I can also have two things of firewood. I am going to need a lot of wood, so I can cook the meals I am making 🙂' 'I completely understand, thank you for compromising with water and food. Wished we had 4 firewoods to divide and share it equaly, may I ask how long will you be camping for? Im afraid I need 2 firewoods as well, maybe we can see who has the greater need? ' 'I am going to be camping for a couple of weeks, so I will need quite a bit. I also realized some additional water would be good, because I have some meals that need me to boil water. Maybe you can have 2 firewood in exchange for me having one of your waters? Then you would still have plenty of water, but also plenty of firewood 🙂'
Utterance: 'So sorry, I just realized you did not agree to the 3 waters in exchange of 3 foods. if you want a water, i will also will need one food. just to make things more fair on my end. If not i am looking at 2 waters, 0 foods, and 1 firewood. But i am willing to compromise for 3 waters, 1 firewood, and 0 foods. and you'll get 3 foods, 2 firewoods, and 0 waters, what do you think?'
[EX A]: Yes

[EX Q]: Context: 'Well fortunately if you are camping that won't be too bad. You'll blend in with the wilderness.' 'My friends will run away. I will not be comfortable either. So how do we split what we have?' 'If they're true friends, they won't. I'll take 2 firewood, 2 water, 3 food.'
Utterance: 'That is very unfair ☹️'
[EX A]:
Yes