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: 'No I cant give you all the firewood. I will take atleast one firewood. Also can I have all three water bottles. ' 'the absolute most water I can spare is 2 and , my firewood is pretty much useless. I can give you 2 water and 1 food for 2 of your firewood that is my final offer' 'Ok. I will have 2 water, 2 firewood and 1 food. Am I correct?'
Utterance: 'no, I can give you 2 water and one food if you give me 2 firewood'

Ex Output:
Yes


Ex Input:
Context: 'I have 10 people in my group' 'I see. I need more water because I came across some people who were lost and they are very dehydrated.' 'I need 2 firewood because it gets below freezing at night'
Utterance: 'Oh I wouldn't want for you to freeze☹️ It also gets cold where I am, so I need 2 firewood as well.'

Ex Output:
No


Ex Input:
Context: 'I have plenty of firewood.  I need two pieces of food though for my hiking.  ' 'one piece wouldn't be enough? i will give all the water' 'Nope, I need two.  I can give you all of the firewood. '
Utterance: 'all the firewood and one food then, not ideal but i can work with that.'

Ex Output:

Yes