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: 'Hello, fellow camper.  Are you ready for our camping trip?' 'I am ready to go camping. I understand there might be some disagreement around the additional supplies we each can choose from?' 'There could be.  However, I think that if we are both reasonable, we should be able to come to an agreement.'
Utterance: '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.'
Example Output: No

Example Input: Context: 'Interesting.  If I decided to forgo water completely, would you accept giving me everything else?' 'no, at the most i can do is i get 2 water, 2 food and 0 firewood or I get 1 water, 3 food and 1 firewood' 'But you get everything you wanted. You said you needed 3 water, I offered it to you.'
Utterance: 'but i can't give you 3 food and 3 firewood, thats 6 items vs the 3 water'
Example Output: Yes

Example Input: Context: 'Hi! I look forward to making a trade with you that's good for us both.'
Utterance: 'Me too, hopefully we can get together on a deal.'
Example Output:
No