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: 'I would do 3 firewood, 2 water and 2 food.' 'I can't do that. Truth is I need the firewood and I was hoping you didn't need it. I propose I keep 1 firewood, 3 waters and 2 food and you take the rest?' 'I would do this instead: 3 firewood, 1 water and 2 food.'
Utterance: 'That's not going to be a fair offer, you'll need to do better than that or I don't think we can come to an agreement'

A: Yes
****
Q: Context: 'yes i can agree to that, thats a good compromise' 'yay, thank you so much! to very I am getting 3 waters, 0 firewood, and 1 food?' 'i will be getting 3 firewood, 0 water and 2 food'
Utterance: 'perfect! submitting deal, thank you so much for understanding'

A: No
****
Q: Context: 
Utterance: 'Hi! I look forward to making a trade with you that's good for us both.'

A:
Yes
****