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: 'That sounds good to me.  What about the food?' 'I would like 2 food, but you may have one. I wouldn't want you to be too hungry!' 'I don't want to be too hungry either but I think perhaps I might need an extra water to compensate for the lack of food.'
Utterance: 'Since I am giving you all of the firewood that you said was most important to you, I feel I should get at least the same amount of items as you, especially since you are getting exactly the firewood you want. I will need to stick to three waters and two food.'

Ex Output:
Yes


Ex Input:
Context: 'Hi! I like to hike so I really need more water. Could I take 2 packages of water and 1 of food and 2 of firewood?' 'I am ok with the water, i just would like one water and one food, but i would appreciate two firewoods, i get cold at night  '
Utterance: 'We both sound pretty reasonable! So you think you need 2 firewood?'

Ex Output:
Yes


Ex Input:
Context: 'understood, I can give you 1 firewood, 2 food, and 2 water to make your trip better.' 'Hm. I''ll definitely take you up on the water, thanks for that. The thing is, I have low blood pressure, and I have trouble regulating my body temperature so I am frequently cold. How about if I take two firewood, and the two waters. It sounds like you are going to do a lot of cooking, so you can take two of the food.  ' 'Will you take two firewood, 1 food, and 1 water?'
Utterance: 'I don't want to take too much food, I want you to be able to enjoy all the cooking you are going to do🙂! But I would like two waters--I'd be afraid of dehydrating on my trip. I'd even throw in the extra food! that would give you all three! you could really do some cooking then! '

Ex Output:

Yes