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: 'how much firewood do you need' 'I would like 2' 'I will  be happy to let you have 3 packs of food , but I need 2 packs of firewood'
Utterance: 'I am also letting you have all 3 packs of water. I think we need to consider how to split the firewood in a fair manner.'

A: Yes
****
Q: Context: 'You can have all the water if I can have all the extra food' 'OK, but first tell me why you need extra food' 'I have 10 people in my group'
Utterance: 'I see. I need more water because I came across some people who were lost and they are very dehydrated.'

A: No
****
Q: Context: 'Hi, how is your trip going? hopefully better than mine'
Utterance: 'My trip is going pretty so so too  im sorry to hear that about yours!! sounds like we both are gonna need some extra stuff? I was wondering if we could start with the water? any chance i could have it all and you can have all of something else? thoughts? im open to discussion'

A:
Yes
****