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.

Ex Input:
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.'

Ex Output:
Yes

Ex Input:
Context: 'Oh yes, I have my whole family coming. I'm really excited because we don't see each other often. My aunts, uncles, cousins. Some of us will hike while others stay back. Maybe we can come to an agreement? Will you also be hiking?' 'Yes hiking for sure. If I take 2 firewoods and give you 2 waters and 1 food, would that be acceptable?' 'I think that could work '
Utterance: 'Thank you. Have a great time and stay safe. It's going to be a blast for sure. '

Ex Output:
No

Ex Input:
Context: 'That doesn't sound like something I can agree to. Do you have any other ideas?' 'I can keep 2 of the firewood then and offer you 2 of the food. I'd take the water, 2 firewood and 1 water' 'I would do 3 firewood, 2 water and 2 food.'
Utterance: 'I can't do that. Truth is I need the firewood and I was hoping you didn't need it. I propose I keep 1 firewood, 3 waters and 2 food and you take the rest?'

Ex Output:
Yes