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 Q]: Context: 'Well, I have two teenage boys who will be with me.  In normal circumstances they go through a lot of food.  While camping, hiking and kayaking I know we will need plenty to keep their energy level high to do everything.🙂' 'Well I will definitely need 2 packages of food and 2 of firewood for survival.' 'I am definitely ok with giving you two of the firewood!!  Why do you need 2 packages of food?'
Utterance: 'I have a very fast metabolism and a dog to take care of. Thanks for the firewood.'
[EX A]: No

[EX Q]: 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 A]: No

[EX Q]: Context: 'That deal is not favorable for me' 'Feel free to counter, but I'm not loving anything that I've gotten so far.' '1 firewood, 2 water, 1 food for me which should mean we each get 2 priority packs -'
Utterance: 'Feel free to counter, but I haven't liked anything so far.'
[EX A]:
No