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: 'so I'll get 2 water, 3 food and 0 firewood?' 'Incorrect. ' 'In order to make it work I need at least 3 water and 2 food. Or I could do 3 firewood and 2 food and 0 water. I don't see any other way around it'
Utterance: 'It has to be fair. Right now I don't think you are being fair. The last offer I gave was great for you. You all all of the food and 2 water.You wanted 3 food in your last offer so thats a great offer I suggested.'

A: Yes
****
Q: Context: 'Hello there. I'd like to discuss making a deal.' 'yes, what would you like?' 'I was thinking I will take all the food and water. You can have the firewood. '
Utterance: 'that's not going to work for me. I need to keep at least 2 foods and 1 firewood but you can have all the water.'

A: Yes
****
Q: Context: 
Utterance: 'What are you most interested in getting?'

A:
No
****