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: 'Since I am giving you all of the firewood that you said was most important to you, I feel I should get at least the same amount of items as you, especially since you are getting exactly the firewood you want. I will need to stick to three waters and two food.' 'The firewood is most important to me to be sure. However, if you get more food and all of the water I could end up going hungry.☹️' 'Well I would be happy to exchange you one of your firewood for the one water you need. That way you won't go thirsty.'
Utterance: 'Hmm, no I think I will agree with your first arrangement. I get 3 firewood and 1 food.'

Output: Yes

Input: Consider Input: Context: 'I need more food since I have a huge family. Can you give me all food i give you all water?' 'i need a little more food because i forgot that we where staying longer and i forgot some of my food. Can i give you 1 food package please? '
Utterance: 'Food is what I need most. I can not survive with less than 2 food'

Output: Yes

Input: Consider Input: Context: 'I will take 2 waters, however I would like 2 food and you can have 1 food and 3 firewoods' 'one food is not enough i am pregnant and i need to eat many meals' 'My friend is ill and needs to eat to survive. How about I take 3 water then and you can have 2 food and all of the wood?'
Utterance: 'sounds reasonable'
Output: Yes