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: 'My main objective for the camp is food and firewood, since I have a large family and the amount of food they give in the camp is very small for all my family and my wife and I have to cook with firewood in the camp.' 'I understand completely. I would like to have all three water, and I'm only traveling with just me, so how about 1 firewood? The rest for you.' 'No me gusta mucho el trato, pero para eso debemos hablar y decidir como adultos un buen trato para los dos. Lo que queremos es disfrutar en el campamento.'
Utterance: 'I do not understand spanish. Please speak to me in English.'

A: No
****
Q: Context: 'I totally understand! I am in need of food too, but it sounds like you really need it so I am hapy to give you all of the food if I can have all of the firewood?' 'What is your need for water?  I could use some of that, too.' 'I am pretty desperate for water! I tend to get thrisy when camping. Can I have 2 of the water?'
Utterance: 'I could live with that but I'd need to get one firewood.  I don't feel comfortable going with so little water but then also not having any firewood, since that's potentially useful for both food and water.'

A: Yes
****
Q: Context: 'I am fine. How is your camping trip going?' 'I'm just finishing the final details of packing. I'm a little concerned I don't have enough of a few things. It is supposed to be over 100 degrees where we are going, and I don't think I have enough water. I'm concerned my kids are going to get dehydrated. I really could use 3 extra packages. ' 'That will not be possible i am afraid. I need at least 2 packages of water too. I have some tabs that i have to take with water regularly.'
Utterance: '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. '

A:
Yes
****