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 think that can be negoiated then i tend to eat less on camping trips' 'Great!  So looks like all the water goes to you.  I will take all the food if that is ok and we can split the wood.  ' 'Well i would need one food and one wood'
Utterance: 'OK.  I think that will work out for me.  You get 3 water, 1 wood and 1 food.  I will take the rest.'

Ex Output:
No


Ex Input:
Context: 
Utterance: 'Hello. I would like to take the following items. (2) Firewood, (2) Water, and Food (2)'

Ex Output:
No


Ex Input:
Context: 'I really need some firewood. ' 'Yeah, that's priority #1 for us as well. If I give you one, could you give us most of the food and water then?' 'I definitely need one firewood. I can use either one more water or one more food. I will leave up to you. '
Utterance: 'Gotcha. I could hand over a package of firewood, 1 food, and water as well. Maybe we'll try out a suggestion and see if it works for both our families.'

Ex Output:

Yes