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.
--------
Question: 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'

Answer: Yes


Question: Context: 'yes. I will definitely give you. I bring extra woods.' 'Great! Can I take 2 and you can have 1?? I am willing to give you 2 of the water then!' 'Its pleasure to me. Will you give food extra 1 to me?'
Utterance: 'I suppose I could do that. I am worried a disease has possibly spread to the area due to the very wet weather, but I can sure fish for most of my food then!'

Answer: No


Question: Context: 'How about I take 2 packs of water, 2 packs of food and 1 firewood' 'Impossible. I will need to cancel the trip altogether.' 'How about I take 2 packs of water while retain your initial request for food and firewood?'
Utterance: 'I cannot allow any water. As I mentioned we will be camping away from all bodies of water and cannot negotiate on that item. I need 3 water, or else I will need to cancel the trip. We might be able to negotiate on the food though.'

Answer:
Yes