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.

Example Input: Context: 'I will have my two packages of food and only one package of firewood. I do not think I can make one package of firewood last for both of my food. ' 'So is your counter that you get 2 packages of food, 0 of water, and 2 of firewood?' 'Yes, I would be happy with two food and two firewood. That would leave you with one food and one firewood as well as all of the water.'
Utterance: 'Ok that sounds fair I agree to that 🙂'
Example Output: Yes

Example Input: Context: 'We can definitely work something out. I'll be sure it'll benefit you more than me. 🙂' 'Oh, well that's really nice of you. What do you propose?' 'You'll get 3 food and 2 water, and I'll take 3 firewood and 1 water. 🙂'
Utterance: 'Hmm, I think that could definitely work! Appreciate it 🙂'
Example Output: Yes

Example Input: Context: 'There could be. However, I think that if we are both reasonable, we should be able to come to an agreement.' 'I think so too. I have a medical condition - type 1 diabetes - that makes it important to bring extra water and food. I'd like to request more of those two items.' 'I don't have a problem with you having extra water. I'll give you all the water, if I can have all of the firewood.'
Utterance: 'I think that's more than fair. That only brings up the food to be divided. One of us is going to have to take less.'
Example Output:
Yes