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.

Example Input: Context: 'You have food and water, this is just extra supplies' 'I know but with my condition i may not make it, especially without more water.😮' 'you can make water by boiling water with all that extra firewood you got'
Utterance: 'you said I could have some firewood'
Example Output: No

Example Input: Context: 'You'll definitely need some additional calories if you want to do extra hiking.  I will give you all the additional food if you give me all the additional firewood. ' 'Sounds like a deal, maybe split the water packages evenly. Can't be dehyradated while camping 🙂' 'Agreed.  Your fun trip could turn into something quite dangerous without that hydration.  '
Utterance: 'Of course, that won't be fun. ☹️ So we have agreed'
Example Output: No

Example Input: Context: 'hy thats my offer' 'Hi there.. I'm sorry, I didn't see your offer as it doesn't show it for 10 messages, I believe.  So, here's the situation.. I think I can get by with less firewood as I'm a Floridian and prefer it cooler anyway.. also the food is not a huge thing for me as we can catch / improvise around the campsite - but I'm definitely interested in as much water as possible.. both for cooking and cleaning purposes, as well as drinking, of course.  🙂' 'okay so what do you suggest'
Utterance: 'Well, I recognize you're gonna need water too.. so I'd love to take 2 of them, giving you one and I'm totally ok with going 1 on the firewood and one on the food.. that way we all ensure we have enough.. you're making out a bit better in quantity that way but I think its best for both of us 🙂'
Example Output:
Yes