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.

Q: Context: 'Which one do you prefer most?' 'They sort of need more water for their meds' 'I'm sorry to hear that! But can you spare 1 for me since you probably don't need all the water.'
Utterance: 'Sure that sounds fair. Thank you. Besides water what do you need for your trip?'

A: Yes
****
Q: Context: 'Agreed! I am running low on firewood, unfortunately, which I need to cook food and stay warm. ' 'Oh no! That's unfortunate! Luckily, I think I have plenty of Firewood for myself so I think it would be okay for you to have more of that if needed. I don't know if I have enough food. I love to snack all day!' 'That's awesome! And oh no! I have a medium amount of food so we can work that out! How are you doing on water?'
Utterance: 'I have a medium amount of water so I would like some more. I wish we had lots of supplies to split up evenly but I'm sure we can work it out🙂'

A: Yes
****
Q: Context: 'Yeah, firewood isn't really something that's "essential" I'd have to say. Yeah, you need it, but still.' 'True. 🙂' 'Seems like we'll be struggling to see who gets the firewood most of all haha'
Utterance: 'No, I like a little firewood.'

A:
No
****