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: 
Utterance: 'I have a family of 7 among of which 4 are in growing stages. Being the first time out with the whole family, we are less prepared and in much need of food.'

Ex Output:
No


Ex Input:
Context: 'Uh oh. What are you preferences on supplies?' 'food, then water, then firewood, and yours?' 'water, food then firewood. It's really hot so I need to make sure we are hydrated. We forgot a bag of supplies that had mostly food so we really could use food. It's hot so firewood isn't necessary. If anything we can get it from around or on a hike.'
Utterance: 'of course, we should help one another, we will figure something out i'm sure'

Ex Output:
Yes


Ex Input:
Context: 'I see.... Well we really would like the firewood too though. Could you reconsider it makes a big difference for us.' 'Sorry I will only consider a deal if I can get at least two fire wood.' 'Well if that is the case then I want 1 Firewood 3 waters and 2 Food then. '
Utterance: 'That is kind of excessive though.... 6 - 3 of an item share? '

Ex Output:

Yes