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: 'I have enough food too. Can I take 2 water, 1 firewood and 2 food?' 'How about two water, 1 firewood and 1 food, since we both value water the most?' 'Is that what you want or what you are offering?'
Utterance: 'That's what I'm offering to you, but I think it's a fair deal, so I'd accept it myself, too.'

Ex Output:
Yes


Ex Input:
Context: 'We cannot budge at all on food. But are more then happy to give up all the extra fire wood for all the food. ' 'Could you trade one food item for either one firewood or water?' 'How about this- You will get 1 food, 1 water and 3 Firewood. I will get 2 Food and 2 Water with 0 Firewood. '
Utterance: 'Hmm, I think I would prefer your original offer instead.  You can have all the food if I can have all the rest.'

Ex Output:
No


Ex Input:
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.'

Ex Output:

Yes


