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.

Context: 'Hi there.. we're looking forward to this camping trip.. hope you are, too! Is there anything in particular you guys need / want out of the extra stockpile we've got?' 'Hello! Which item do you need the most?' 'Well we actually really NEED all three items.. but I know you might, too - so I want to make a deal that's fair for you.. is there anything in particular your family needs for the trip?'
Utterance: 'Well, there has to be an item that you need the most. If you tell me what you need the most, we can try to make a deal around it.'
Yes

Context: 'okay so what do you suggest' 'Well, I recognize you're gonna need water too.. so I'd love to take 2 of them, giving you one and I'm totally ok with going 1 on the firewood and one on the food.. that way we all ensure we have enough.. you're making out a bit better in quantity that way but I think its best for both of us 🙂' 'i botttle of water for a can of food and 2 firewoods'
Utterance: 'Yeah, sorry, that's not going to work out for me. I'm going to need at least 2 bottles of water, 1 food packet, and one firewood.. again, this does leave you with two each on the food and the firewood, which are both very important things for this camping trip!'
No

Context: 'I agree! Nice to meet you... I have two boys who always eat! Any chance I canget 2 food?' 'Food is the item of greatest value to you?' 'It is! What do you think?'
Utterance: 'The item of greatest value to me is WATER. Before thinking about an offer I need to know what your priorities are and you need to know mine in order to conclude something fair for both of you.'
Yes