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.

Example Input: Context: 'Hello 🙂 Hope you have a good amount of supplies for your trip!' 'Not really! I will need you to give me 3 food, 2 water and 2 firewood.'
Utterance: 'Yea, that's not going to work for me. That would leave me with NO food, and only 1 water, and 1 firewood. Would you take that deal, if I offered it back to you?'
Example Output: Yes

Example Input: Context: 'I do have a little hike planned, so the water comes in handy. I am more excited to relax and fish' 'Well I want to go run the trail, but like to check it out first. Perhaps we could walk one together. perhaps in a couple moments we could fix the supply situation .' 'Yeah, that would be fun. '
Utterance: 'Well, why dont you propose how to divvy up the packages and we can get on with out camping?'
Example Output: No

Example Input: Context: 'hello, lets share these items. I really need the firewood. I have asthma and I have to stay warm' 'How much firewood do you need?' 'i need two food items and one water'
Utterance: 'I will take 2 waters, however I would like 2 food and you can have 1 food and 3 firewoods'
Example Output:
No