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: 'Hello! I am a mother of two and I have two kids who need extra food and water' 'Okay, I need food and water too unfortunately. We can discuss this.🙂' 'Alright... my baby is on formula and needs water for her bottles. My son snacks all day and really needs food. Otherwise, he will starve and won't thrive'
Utterance: 'Okay, maybe wwe can split the food and water somehow. I don't know how.🙂'

Ex Output:
Yes


Ex Input:
Context: 'so water, firewood and food for you, and water food and firewood for me. what do you suggest' 'I'm not much of a food fan knowing that without firewood you die of hypothermia if wet, one can survive without food/ with little food for months' 'so let's do this quick, how about 2 water for you, 1 water for me, 0 food for you, 3 food for me'
Utterance: 'good excellent choice'

Ex Output:
No


Ex Input:
Context: 'That is good, is it possible that I could get some firewood as well? I may be suffering from hypothermia.' 'Oh wow! I don't want you to be that cold! :o  If I can have 3 food, I'd be happy for you to have 2 firewood.' 'That would be great, I'm not real hungry, so I can spare some food.'
Utterance: 'That sounds fair to me! So we've got 2 water and 2 firewood for you, 3 food and 1 each water and firewood for me.'

Ex Output:

Yes