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: 'hy thats my offer' 'Hi there.. I'm sorry, I didn't see your offer as it doesn't show it for 10 messages, I believe. So, here's the situation.. I think I can get by with less firewood as I'm a Floridian and prefer it cooler anyway.. also the food is not a huge thing for me as we can catch / improvise around the campsite - but I'm definitely interested in as much water as possible.. both for cooking and cleaning purposes, as well as drinking, of course. 🙂' 'okay so what do you suggest'
Utterance: 'Well, I recognize you're gonna need water too.. so I'd love to take 2 of them, giving you one and I'm totally ok with going 1 on the firewood and one on the food.. that way we all ensure we have enough.. you're making out a bit better in quantity that way but I think its best for both of us 🙂'
Example Output: Yes

Example Input: Context: 'understood, I can give you 1 firewood, 2 food, and 2 water to make your trip better.' 'Hm. I''ll definitely take you up on the water, thanks for that. The thing is, I have low blood pressure, and I have trouble regulating my body temperature so I am frequently cold. How about if I take two firewood, and the two waters. It sounds like you are going to do a lot of cooking, so you can take two of the food. ' 'Will you take two firewood, 1 food, and 1 water?'
Utterance: 'I don't want to take too much food, I want you to be able to enjoy all the cooking you are going to do🙂! But I would like two waters--I'd be afraid of dehydrating on my trip. I'd even throw in the extra food! that would give you all three! you could really do some cooking then! '
Example Output: Yes

Example Input: Context: 'So now you need 3 firewood with 1 food. Am I correct?🙂' 'Yes, that sounds fair to me. Although I would be willing to take a water if you're offering it, I am not quite as lucky with water. ☹️' 'How It will be. you already told that, you have lot of food with you. So can you please think how it will be. you can take all 3 firewood with 1 water and I will take all 3 foods packages and 2 water.'
Utterance: 'That sounds fair. I will accept that, all I really need is the firewood anyways! Thank you so much.'
Example Output:
Yes