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.

Ex Input:
Context: 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.' 'Hmmm i don't beleive i ever offered you everything for all the food. I will need at least one water. lets not be selfish.' 'Oh you are right sorry, I was mistaken.  Okay then, how about I get 1 food, 2 waters, and 3 firewood.  You can have 2 food and 1 water?'
Utterance: 'Well that would give you 6 rations and me 3. Again that is not very fair. If you want 1 food and all the fire wood that i need at least 2 waters. so again, 1 food, 1 water 3 wood for you'

Ex Output:
Yes


Ex Input:
Context: 'oh my are you going somewhere cold? I could use the water, I am going on a charity event with kids from the Make A Wish foundation. Its going to be their first time!' 'Ok I will give you 3 waters if you give me 3 firewood' 'sure i can do that, what about the food then? how much food would you need for the tip?  can you hunt where you are going?'
Utterance: 'I am up to u '

Ex Output:
No


Ex Input:
Context: 'I would need more firewood for my camping trip. ' 'That is good to know. Firewood Isn't very important to me, so you are welcome to all of that if you need it. ' 'It's nice to know the firewood is not important to your camping trip. I'm glad I can have all the firewood to myself. How do we get to share the other resources. '
Utterance: 'Actually, I think I may need more food than water. How about I take the food and we can split the water. You may have 2 waters, if you need them.'

Ex Output:

No