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: 'Yes, can you live with two foods? ' 'I can. How about firewood? I would like 2 if possible.' 'Well there are only 3.'
Utterance: 'Of course. Since you're getting more water, I was hoping to get 2 firewood, and you could have the remaining 1. Would that work for you?'

A: Yes
****
Q: Context: 'Hello! I am a mother of two and I have two kids who need extra food and water' 'Okay, I need food and water too unfortunately. We can discuss this.🙂' 'Alright... my baby is on formula and needs water for her bottles. My son snacks all day and really needs food. Otherwise, he will starve and won't thrive'
Utterance: 'Okay, maybe wwe can split the food and water somehow. I don't know how.🙂'

A: Yes
****
Q: Context: 
Utterance: 'I need the firewood and the food, you can have all the water.'

A:
No
****