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: 'Zero water is not going to work 😮. I am willing to switch water and firewood amounts so that I get 2 firewood and 1 water and you get 2 water and 1 firewood. ' 'Alright. But than I will need at least 1 food than. So it would be 2 water for me 1 for you, 1 food for me 2 for you and 1 firewood for me and 2 for you. 🙂' 'I think that sounds ok, I will make that deal with you whenever we can go through with it. 🙂'
Utterance: 'Smashing🙂 Sounds good with me. Happy to get it all sorted out. cheers'
[A]: No

[Q]: Context: 'I do understand. That will work for me. ' 'Could you tell me about why you want water? ' 'I want water so I can keep hydrated during this camping trip. It's important for me to drink bottled water vs. getting water out at camping as it may flare up my disease. '
Utterance: 'Oh interesting! I have a device that allows me to drink pond/stream water by cleaning it, so water isn't as important to me.'
[A]: No

[Q]: Context: 'If I do that, I will need all the food, since I won't be able to cook much fish.' 'I see. I do need at least 1 food package because I will be spending lots of calories working. But I can give you all the water.' 'How about this, you get one firewood and one food, and I get all the water?'
Utterance: 'No, sorry. How about you get one firewood, two food and all the water?'
[A]:
Yes