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: 'i can do that for you, in on a diet anyways and already have a stock ive been working on since fall' 'oh well that's fantastic, so let me know what your deal is' ' 3 on food, 1 on firewood and 1 on water😮'
Utterance: 'Thats what your deal is or my deal, cmon man!'
No

Context: 'yes friend. i going to trip with my team.in my team old age sicked people and kid are there so i need some favor in extra package' 'Well i am also going on a trip, in a very cold climate, unfortunately i have a medical condition where i need to stay hydrated and warm or i can have siezures' 'i understand friend. i need 2 pack of water and 3 pack of food and 2 pack of fire wood. can you please help me '
Utterance: 'No way can you have everything, I will need 3 packs of firewood 2 backs of water then you can have all the food'
Yes

Context: 
Utterance: 'Hello, I really need more firewood, in exchange for me taking more of that you can have more food and we can split the water evenly 🙂'

Yes