TASK DEFINITION: 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.
PROBLEM: Context: 'How many persons are you feeding? I am feeding 2 adults and 2 children.' '2 adults and 3 children, so if I get 2 food and 1 water, you could get 1 food and 2 water? ' 'I believe we can work with 1 food and 2 waters.🙂'
Utterance: 'So 1 package of firewood, 2 food and 1 water for me and 2 packages of  firewood, 1 food and 2 waters for you? Sound good? '

SOLUTION: Yes

PROBLEM: Context: 'Well I am happy to give you all my food in exchange for all your water.' 'We can do that! How do you want to split up the firewood?' 'It's an odd number so someone has to get 2. But in order to make it fair if one of us takes two then the other should get one of the lower priority items. What do you think?'
Utterance: 'That sounds fair to me! I am good either way.'

SOLUTION: Yes

PROBLEM: Context: 'Well maybe we can work something out between us.  Our food and water was in the bags they loss so I really need those.  Do you think you could make do with 1 food and some water?' 'I really need 2 foods. I can do with 1 water or if you are in a giving mood then maybe I can have 2 waters? 🙂' 'Looks like we both really need the food.  If you get 2 food I would need 1 food, 2 water and 3 firewood. '
Utterance: 'Since you will get all the fire would do you think I could have 2 foods and 2 waters. You would get 1 food, 1 water, and 3 firewood. 🙂 You seem like you are a great outdoor person that I would think you would be able to catch some fish to cook with the firewood. 🙂'

SOLUTION:
Yes