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: 'Do you have a deal to offer?' 'I would like 2 firewood, and I don't care about anything else. I would give you 2 water and 3 food' 'I will give you 1 firewood for 3 waters and 3 foods. '
Utterance: 'Nah I'll pass'

Output: Yes


Input: Consider Input: Context: 'Hm. Getting warmer. What do you need the most of? ' 'I need more water than the other options, you can keep 2 food and 2 firewood but 1 water' 'I also feel that water is the most important. How about I take all 3 water, and you can take 2 firewood, and 2 foods?'
Utterance: 'I think the fairest thing would be that you keep 1 water, 2 food, 2 firewood'

Output: Yes


Input: Consider Input: Context: 'Yes, that would be fair. How much of Firewood would you need?' '2 firewood and 2 food and 1 water.' 'I get it as you need more firewood for the additional package of food.'
Utterance: 'exactly, and forgot some of my extra wood at the house again.'


Output: No