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: 'Yeah, it's very sad these days' 'Then I got here and noticed I didn't pack my cooking sterno and critters go into some of my food☹️Kinda puts a damper on the trip.' 'Oh, i see. How about you get 2 food 1 firewood and 1 water. I need the extra firewood to stay warm at night'
Utterance: 'Yeah, that should work. I brought plenty of water and the critters left that alone. You planning to go out on the trails at all?'

Ex Output:
No


Ex Input:
Context: 'Haha I suck at those activities as well. I don't usually don't eat a lot, so I'm happy to exchange some food supplies for water supplies. ' 'I would be willing to do that. What do you propose?' 'I get 2 water, 1 food and 1 firewood, you get 1 water, 2 food and 2 firewood. '
Utterance: 'You know what that sounds extremely fair. I would accept that offer'

Ex Output:
Yes


Ex Input:
Context: 'I love s'mores.  Food is my number one concern though.  If I'm only getting 1 of the food I really need all of the water.  How does that sound?' 'So I get only 3 packages? 2 food and 1 firewood? ' 'Do you need more firewood?  I could compromise there.'
Utterance: 'How about I get 2 food and 2 firewood? You can get all the water plus 1 food and 1 firewood? '

Ex Output:

No