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: 'Agreed.  Your fun trip could turn into something quite dangerous without that hydration.  ' 'Of course, that won't be fun. ☹️ So we have agreed' 'Mostly - since we cannot split the water 1-1, do you mind if I take the extra one? 🙂 '
Utterance: 'That's fine, you might need it more.'
No

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'
No

Context: 'What about I have all the food, and you can have everything else? I would think that seems pretty fair.' 'Sorry, I understand where you are coming from but I really need at least one food.  ' 'I'm sorry. I would really appreciate having all the foods, because this camping trip is a get togther with my 5 friends one of whom is her birthday and recently lost her mom. So we need lots of snacks to help her celebrate her birthday and support her during this hard time.'
Utterance: 'No I can't do without a food for me.  We can wrap this up if you take 2 food and a water. 🙂🙂'

No