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.

Context: 'If you make it two food, we have a deal.' 'I would rather let you have the third water than other food. I don't like fish. ☹️' 'Okay, you can have two firewood and and two food, I'll take the rest.'
Utterance: 'Ok. That seems fair enough to me.'
Yes

Context: 'I would like 2 firewood, and I don't care about anything else. I would give you 2 water and 3 food' 'I will give you 1 firewood for 3 waters and 3 foods. ' 'Nah I'll pass'
Utterance: 'Do you have another deal to offer? ☹️'
No

Context: 'Yes I can give you the three food but I need 2 water. I can become very thirsty. ' 'Yes that is totally fine with me. What about firewood' 'I can give you 1 of the firewood. I would like to stay warm at night so I want 2. 😮'
Utterance: 'Hmm that's going to be hard for me because I also get cold. what other reasons do you have?'

No