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 elicit-pref strategy, otherwise output No. elicit-pref is a cooperative negotiation strategy. It is used to discover the preference order of the opponent in the negotiation.

[Q]: Context: 'Which supplies do you need?' 'Well, I really need water in case we get really thirsty from hiking. I also need firewood in case it gets colder and we need more. It would be cool to have more food added for dessert like s'mores, but it's not really necessary.' 'How about you take all the water and one of the firewoods, and I can have all the food and 2 of the firewoods'
Utterance: 'Let me think about it. What supplies do you need?'
[A]: Yes

[Q]: Context: 'Hi there! Curious as to what's on your mind regarding each item. I have my own preferences, but will share after you.' 'Hello, well I really need food. Have a lot of extra people.'
Utterance: 'Awesome - same, I also need a ton of food. Will firewood be of interest to you as well? I'll be happy to compensate in this way'
[A]: Yes

[Q]: Context: 'That's a good idea.Let me think. How about 3 Firewood, 1 Food and 2 waters for me.' 'That will not work for me at all. ' 'I see. Then how does 2 Firewood, 1 food and 1 water for me sound? You'll be getting 1, Wood 2 Foods and 1 Water'
Utterance: 'Your calculations are incorrect. There are 3 firewood, 3 food, and 3 water. You are missing a water. I will return to my original offer since you need firewood the most and I need food the most. I take all the food, you take all the wood. And then you can take 1 water as you just suggested. '
[A]:
No