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: 'I would like a little extra food for myself as well. Would you be willing to split the food 1 for me and 2 for you? ' 'I'd be willing to do that if you gave me some water and firewood in exchange' 'How about I keep 2 firewood, you take 1? What do you propose for the water?'
Utterance: '1 food for 1 firewood isn't a good trade for me. I would need at least 1 firewood and 1 water to trade for 1 food.'

Output: Yes


Input: Consider Input: Context: 'hello, I am good, I am very excited about this trip. how are you?' 'i am great, super excited about camping as well, are there any supplies that you really need?' 'i really need water and food. we did not get enough of those.'
Utterance: 'Those are my priorities as well, how about you get all the food and two firewoods, and i get all the water and one firewood, does that sound fair?'

Output: Yes


Input: Consider Input: Context: 'Hello! I believe that we can help each other here.' 'hi how are you, what help you need?'
Utterance: 'Lets strike balance like 1/2 2/1 3/0'


Output: Yes