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: 'hi 🙂' 'I was thinking that you could give me 3 food packages and i will give you 3 water? What do you think?'
Utterance: 'If I do that I would also like all three firewood'
Example Output: No

Example Input: Context: 'I would like to do some hiking before getting back to the campfire. I especially like hiking when the weather is cooler. It works up my appetite for those hot dogs and marshmallows, which are one of the best parts of camping for sure! 🙂' 'How about I take 3 firewood, 2 food, and 0 water?' 'I like that deal, but I feel like you might need at least one water? ☹️ What if instead you take 3 firewood, 2 food and 1 water? And I could take 0 firewood, 1 food and 2 water? I'm okay with fewer items. I don't need much to get by, but I sure need 2 of the 3 waters.'
Utterance: 'Are you sure that you want to give me that much? 😮  If you're sure, that would work for me.'
Example Output: Yes

Example Input: Context: 'Can you help out? I can easily dehydrated can you give all the water packages to me?'
Utterance: 'I can spare a little as I am currently taking medication that requires me to drink a lot. I can give you 2 bottles of water if you can give me 3 firewood'
Example Output:
No