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: 'Oh yes, sorry I am so caught up with my wound I completely forgot about that. I can spare 1 firewood so you would get 2, do you think you could spare another water in exchange for the wood?' 'i cant unfortunately i really need the two water im sorry. ' 'im so sorrry unfortunately i am in dire need of two wood we are in a very cold climate'
Utterance: 'how about i get 1 water, 2 food, and 2 firewood since I'll be here so long? because of my leg i likely won't be able to leave anytime soon'
[A]: Yes


[Q]: Context: 
Utterance: 'Hi  - nice to meet you!  I hope we can work out a deal that is good for both of us.'
[A]: Yes


[Q]: Context: 'I would really like 2 water and 2 firewood and 1 food.' 'I would like 3 water no firewood and 2 food. I have 8 people in my family and I have a medical condition where I can only drink water and have to drink 100 ounces per day.' 'Water if very important to me as well. I'm on a medication where I get dehydrated very quickly and I need to make sure that I'm properly hydrated at all times. '
Utterance: 'Well that is going to be a problem then because I have a medical condition too. How can we meet in the middle? I get 2 water, 2 food and no firewood?'
[A]:
Yes