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: 'Okay, but water is important to me because I have health issues. So I drink more water for save my health.' 'Okay! You can have all the water. I want all the food.' 'yeah sure, I will share with you all the food. What is about firewood?'
Utterance: 'You can have two if I can have one if you're okay with that.'

Output: Yes

Input: Consider Input: Context: 'Hi there, how are you doing?' 'I am great. Excited to go camping. How much food do you need?' 'I could use some extra food, I'll be hosting a get-together at my campsite later and will need some to entertain the guests. I'd like 2.'
Utterance: 'That is fine. I can go fishing to get some extra food but I would still like one. Can I take two packages of firewood so I can cook them? '

Output: No

Input: Consider Input: Context: 'I see, well it sounds like you're going to need some additional food with those children. How about I provide you with some additional food and you can help me with my need for heat with firewood?' 'okay how i take all 3 food and 1 firewood?' 'The firewood sounds like a solid deal; I would need a little food though to assist me. The good news is since there's a stream near me, I won't need any additional water, so I am happy to provide you with all of the additional water.'
Utterance: 'i am not able to do that unfortunately i desperately need firewood. '
Output: Yes