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 love camping also!  Yes, I can see how you would need firewood if you want to cook your food.  So, food is more important to you than water?' 'Yes, I will need a little water to wash that food down with though. Are you going to be needing a lot of water?' 'Yes, I may need more water.  I am on a diet and I don't really cook either!  Hopefully we can work something out here.'
Utterance: 'That sounds great. I probably need to go on a diet, but I like my food to much. LOL'
[EX A]: No

[EX Q]: Context: 'There could be.  However, I think that if we are both reasonable, we should be able to come to an agreement.' 'I think so too. I have a medical condition - type 1 diabetes - that makes it important to bring extra water and food. I'd like to request more of those two items.' 'I don't have a problem with you having extra water.  I'll give you all the water, if I can have all of the firewood.'
Utterance: 'I think that's more than fair. That only brings up the food to be divided. One of us is going to have to take less.'
[EX A]: Yes

[EX Q]: Context: 'Thank you for asking, I would really like some extra fire wood as I usually get cold and scared at night so I can keep a fire going.' 'I'd be willing to give you all my firewood if you could give me all the water.' 'I do need at least one extra water bottle in case the fire goes out of control, but I am willing to forgo any food as I can forage for food.'
Utterance: 'Alright. Thanks. I only ask for so much of the water because I am overweight and I know while camping I'll work up a huge sweat.'
[EX A]:
No