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.

Q: Context: 'Is that what you want or what you are offering?' 'That's what I'm offering to you, but I think it's a fair deal, so I'd accept it myself, too.' 'Fair enough.'
Utterance: 'If that sounds good, just tell me which bundle you want.'

A: No
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Q: Context: 'I have an idea. I could give you 3 firewood and you give me 3 water and 3 food. ' 'That would be great but I could find myself in need of some extra water. Don't want t get dehydrated from all the dancing! Could I trade you one of the firewood for 2 of the water?' 'I see. How about you get 2 firewood 1 water 1 food. And I get 1 firewod 2 water 2 food?'
Utterance: 'I think that sounds fair. So I would get 2 firewood, 1 water and 1 food. You could get 1 firewood, 2 water, 2 food. Is that correct?'

A: Yes
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Q: Context: 'That seems fair however I would like to have plenty of food also. I think it would be fair to have 2 firewood, 1 food and 2 water ' 'I ain't sure if you want 1 or 2 packages of food' 'I would like 2 packages of food'
Utterance: 'As you need 2 of firewood, I think we can have a fair deal like 1-2 of food and firewood or 2-1 of food and firewood.'

A:
Yes
****