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: 'I can give you 2 packages of food or firewood instead' 'Hmm. I'm not able to compromise on this, I'm fine with 1 package of firewood and food each.' 'I really need 2 packages of water '
Utterance: 'I get dehydrated quickly, so given my condition, I'm not able to compromise on water.'

A: Yes
****
Q: Context: 'I can give you 2 units of water, but I need at least 1. ' 'I also need firewood, I have some health issues.  I need the wood to keep warm at night, and for cooking fish.' 'I can give you 2 units of firewood, but I need at least 1 as well. '
Utterance: 'How much food do you need?'

A: No
****
Q: Context: 'How about I take 2 packs of water while retain your initial request for food and firewood?' 'I cannot allow any water. As I mentioned we will be camping away from all bodies of water and cannot negotiate on that item. I need 3 water, or else I will need to cancel the trip. We might be able to negotiate on the food though.' 'I need to have at least a pack of water. How about 1 water, 3 firewood and 1 food?'
Utterance: 'Okay. I fear some of us may die of thirst, but I will give you 1 water. I can't agree to those terms though. I can give you 1 water 1 firewood and 2 food. That is my final offer though.'

A:
Yes
****