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.

[EX Q]: Context: 'yes of course!' 'great!' 'So we have agreed i get 2 foods and 3 waters and you get 1 food and 3 firewood? does that sound good?'
Utterance: 'I thought you just wanted 2 waters?'
[EX A]: No

[EX Q]: Context: 'Would you be willing to let me have all the firewood and you could take 2 of the food and 2 of the water?' 'No I can't do that unfortunately./' 'Ok, so I could take 2 firewood, 1 food, and 1 water, the original deal, do you still want to do that one?'
Utterance: 'I would prefer the original deal'
[EX A]: No

[EX Q]: Context: 
Utterance: 'hi, how are you? my main need is water. how bout you?'
[EX A]:
Yes