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: 'that won't be fair, how about I get 1 water, 3 food and 1 firewood, that way u get the most water' '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'
Utterance: 'But you get everything you wanted. You said you needed 3 water, I offered it to you.'
Example Output: Yes

Example Input: Context: 'You get 2 food, 1 firewood and 1 water' 'I am okay with that deal. What is your opinion?' 'sounds good. I will go ahead and put it in on my end'
Utterance: 'Okay. I will give you 1 food, 2 water and 2 firewood'
Example Output: No

Example Input: Context: 'Hello.  How are you?' 'not too bad, looking forward to a good camping trip 🙂' 'Yes!  This camping trip is going to be great!  I hope to make it very memorable.'
Utterance: 'indeed.  anyways, I would like to divide the extra supplies equitably'
Example Output:
Yes