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.

Input: Consider Input: Context: 'Hmmm, I think I really need the firewood. I brought softwoods and they burn out quickly so I don't think I'll have enough wood to keep me going through the night. I get kinda scared without the fire. What is your priority?' 'Okay, well firewood is also my top priority since it will be so cold tonight. But I would be willing to take only 1 firewood (and give you 2) as long as I got 2 foods and 2 waters ' 'Thank you for the offer on firewood. I think that sounds fair. However, I really would like at least 2 waters as well. '
Utterance: 'Hmm unfortunately I can't budge since I would be accepting less of my top priority item. It sounds fair to me though; I'd get 5 items in total but less of my top priority and you would get 4 items in total but more of your top priority'

Output: Yes

Input: Consider Input: Context: 'Hello! how are you? hoping today is finding you well. I was wondering if I can get all 3 of your Firewood, I am willing to trade for all 3 waters. I am camping with 40 kids, its our annual youth camp. its rainy season too, I really want to ensure I have enough dried wood with us. need lots of firewood for the amount of cooking I will be doing, keep the camp warm, and specially to keep those pesky bugs away. what do you think?' 'I could really use the firewood too, it will be very cold where we are going. Since it will be cold, we will not be drinking much water. How about 2 firewood for you, 3 food for me?, ' 'May I ask how many are going camping with you, i would agree, but the needs of children are different than adults. I will need at least 1 food, to ensure I have enough for the kids. '
Utterance: 'We will have 50 adults with us. How about 2 firewood, 1 food, 1 water for you?🙂'

Output: No

Input: Consider Input: Context: 'I don't think I will be able to give you 2 waters. I'm desperate. I need at least 2. I would give you 1 if I could get 3 packages of food. I would give you all the firewood. ' 'If i give you 3 packages of food then i will take 3 packages of firewood.' 'So I get 2 waters and 3 foods. and you get the rest?'
Utterance: 'I could use one food too. How am i going to survive without eating anything?'
Output: Yes