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.

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! '
Yes

Context: 'I am sooooo excited too! I can't wait to sit by the fire! 🙂' 'Me too!!!! That is what I am most excited about. I was actually hoping you might have some firewood to spare?' 'Gosh, that's a bg favor because I need the firewood. I will give you all of the firewood if you will give me all of the food. How's that?'
Utterance: 'Fair enough! Thank you! I would really appreciate any extra water that you have too?'
Yes

Context: 'Hello.  I'm actually not doing too well.  There have been a few problems and I will need some of the extra packages.  I'll need two of the waters, 2 of the firewood and 2 of the food.' 'I'm sorry to hear that you are not doing well.  I've also have some issues.  On the way up to the camp site, all of my clean water spilled in the car.  I was really hoping to be able to get all of the available water.  Why aren't you well?  I hope it's not serious.  ☹️' 'Oh, that's terrible.  I'm sorry that happened.  I need the water for my child.  They seem dehydrated and disoriented.  My husband has also caught a cold and has been having chills.  I thought the extra firewood would help him feel better.'
Utterance: 'Oh my gosh.  You are not having an easy trip.  If your children are dehydrated and disoriented, perhaps you should get them to emergency care immediately.  I would like to provide you will all of the water in the meantime, but that would leave me with none at all.  I wouldn't have your husband out of the tent with chills.  Perhaps you should keep him bundled in your cabin.  I forgot my portable propane grill - so I would need some firewood.  How about I take 2 waters, 1 firewood and all of the food?'

No