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.

Example Input: Context: 'I know this isn't your problem, but I'm a student and I had to come up here to take photos of the night sky for my astronomy class. I slept really late today as I have to sit up all night to get the different stars, and possibly even the space station if it's clear enough out. I have to sit by a fire to stay warm so I can get these pictures to hand in to my professor tomorrow.' 'You know that is very impressive.  I admire your determination and effort you put into your class.  You must be very passionate about astronomy.' 'I am. My favorite personality is Neil DeGrasse Tyson. He's amazing, funny and incredibly smart. I'm hoping to get an internship at the Planetarium in my senior year 🙂'
Utterance: 'That's amazing!!!  So here is the deal...I'll give you the 2 firewood packages so you can sleep under the stars tonight.  In return I'll have to keep 2 water packages and 2 food packages since I won't be able to cook all of this fish and I still have a family to feed.  '
Example Output: No

Example Input: Context: 'doesn't really seem fair for you to get all the firewood. I would like to have at least one because then we're completely in the dark.' 'You get lots of water and food for your children, I am cutting back on my goals by giving up energy which means I have spend more time outside hiking.  I do need to stay warm' 'yes which is why you have two firewood. I think it is fair for me to get at least one. If food is so important to you then I'll give you two food. but we would be in the dark'
Utterance: 'I suppose that's fair enough.'
Example Output: Yes

Example Input: Context: 'Hi! Which items are important to you?' 'Food is the most important to me because I need to eat more often so that I can take my medications.  ' 'Yeah, that is important. I do not have a problem letting you have more food than me.'
Utterance: 'Would it be possible to get an extra water also?  How do you feel about the firewood?  I wish we could split everything evenly.🙂'
Example Output:
Yes