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 really like to have 3 waters and 3 firewood because this is my first time camping and I don't have survival skills. '
Utterance: 'You must be a comedian.  We will need to come to a compromise because there's no way that's going to happen.  I am like a water buffalo so I'll need at least two waters.  In addition, my family is from the South and will need firewood as well.'

A: Yes
****
Q: Context: 'I would like 2' 'I will  be happy to let you have 3 packs of food , but I need 2 packs of firewood' 'I am also letting you have all 3 packs of water. I think we need to consider how to split the firewood in a fair manner.'
Utterance: 'What do you think is  a fair deal with the firewood'

A: Yes
****
Q: Context: 'I prefer to have the most water as I have a medical condition that requires me to stay extremely hydrated at all times. If I get too dehydrated, it's extremely bad for me. How about I get 3 water and 1 food, and 2 firewood?' 'I'll give you the 3 water, 1 firewood. How about I get 3 food and 2 firewood? I'll need the fire to cook my food.' 'I would need firewood to cook my food as well. I would like the 3 water, 1 food, and 1 firewood, what about that? '
Utterance: 'Since the value of water exceeds both food & firewood, I think it's fair for me to receive the extra dose of firewood. My offer to you is: you get 3 water, 1 food,  0 firewood.  I would get 0 water, 2 food, 3 firewood.'

A:
Yes
****