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: 'Grilling is so much fun!  We left our grill at home so we can't really do that.  I will trade you some food for some water if you would like?' 'sure that sounds fair' 'Ok, do you have any interest in any fire wood?'
Utterance: 'I do need firewood, we cook over open flames. 😮How you get 2 water, 1 food and 1 firewood?'

Output: No


Input: Consider Input: Context: 'That's just too big of an ask. How about I get 3 firewood and 1 water and you can have the rest' 'I really need the extra firewood.  I hiked 5 miles o this camping spot and I need the extra firewood to stay warm and to keep the wild animals away at night.' 'I really need some of the firewood too. I am expecting a big group of people to attend, and I can really use it. it gets really cold at night where we camp. What do you suggest is a more fair deal to the both of us?'
Utterance: 'I will give you one extra package of firewood. You can have all 3 packages of food 1 package of water for your group of friends. Does that sound good?🙂'

Output: Yes


Input: Consider Input: Context: 'Awesome - same, I also need a ton of food. Will firewood be of interest to you as well? I'll be happy to compensate in this way' 'Firewood is not overly interesting to me, but water is somewhat enticing.' 'Ok, great - I can give you all of my waters in exchange for a majority of the food and half of firewood'
Utterance: 'Half of firewood? There are 3 so one of us has to get more. I would need more of that. '


Output: No