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: 'I'm doing well. I'm very excited about our camping trip!' 'I am too! I have a rather large family and we are looking forward to getting out for some time away!' 'How nice. I am bringing my daughter and her girl scout troop. I am the co leader.'
Utterance: 'Oh that'
[EX A]: No

[EX Q]: Context: 'I need Food, what is yours?' 'I kinda need water because I get dry mouth very often.  so without water it will make it hard to achieve getting other items in the wilderness.' 'Ok thats nice, I need food more because I didn't bring much and that a problem,  What do you think if I give you 2 wood and you give me 2 food?'
Utterance: '🙂 Well let me counter it, more beneficial to both of us, you will get 1 water, 2 food and 2 firewood as I can easily find firewood in the forest.  The water due to my dry mouth illness, I need the most ☹️'
[EX A]: Yes

[EX Q]: Context: 'I would need some firewood as well, as I need it to cook the food. I was thinking maybe you can have all the water and I have all the food.' 'All the food is too much, I would need at least one package of the food for my group. I was thinking you could have 2 of the food packages and I have 1, then I get all the water and the majority of the firewood. That leaves you with 2 of the high priority food packages and a package of firewood to cook the food.' 'That seems quite unfair. I really would like my camping trip to be enjoyable.'
Utterance: 'I understand. What part of the deal is unfair to you? You get the majority of the highest priority item (food) and I get the majority of the lower priority items (water and firewood).'
[EX A]:
Yes