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.

Input: Consider Input: Context: 'Hey, Nice getting to interact with you. I would need additional packages of food as I'm camping with Family and my kids tend to get hungry often.' 'I also have a family I am camping with several small childern and my wife who is pregnant. I need plenty of firewood and water.'
Utterance: 'I get it, in that case and to be a fair deal. I will have 2 of food, 1 of water and firewood each.'

Output: Yes

Input: Consider Input: Context: 'I have a medium amount of water so I would like some more. I wish we had lots of supplies to split up evenly but I'm sure we can work it out🙂' 'I agree! We can figure out working out a deal! What if I gave you 2 food and 2 waters and you gave me your wood and one of food/water? If that doesn't work for you we can also figure something else out.' 'I think that sounds reasonable. Of course, I could counter with I take 2 food, 2 waters and 1 firewood. What do you think of that?'
Utterance: 'That is also good. This is hard to work out since it's uneven haha. What about if I give you all my food, you give me all your firewood, and then I can give you 2 waters? I think that'd be more fair for you. '

Output: Yes

Input: Consider Input: Context: 'Well you can take all the firewood if it will help, would it be ok if i get all the food in return?' 'That works for me. How would you like to divide the water?' 'I am ok with you taking two waters since you are new to camping, does that seem fair to you?'
Utterance: 'Yes, that seems fair to me.'
Output: Yes