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: 'Great! What extra supplies would you like to bring?' 'Since it's hot there, I get thirsty and dry real quick. 😡' 'Oh ok, well I plan on bringing some juice, beer and other drinks. So I could spare some extra water. And I am pretty good at fishing, so I won't need much food either'
Utterance: 'How nice of you. I certain we can work something out. 🙂'
[EX A]: No

[EX Q]: Context: 'Can I take all three bundles of firewood so I can boil some of the water? ' 'Sorry, I want some firewood, I planned to enjoy this chill climate using firewood' 'Alright. If you take one firewood can I also have two packages of food? '
Utterance: 'That doesn't work for me, May I ask why do you need two packages of food?'
[EX A]: Yes

[EX Q]: Context: 'HI, I will have all of the packages of food and 2 waters and 2 firewood and you can have the rest. Unless none is needed for you then I will take them all.' 'i will need 3 firewood packets. I have a terrible disease that prevents my circulation from working properly.' 'That does sound bad. I am going camping and my kids might want to stay up late so I will need extra firewood for this to keep light and more warmth. I will take all 3 extra of the food and the water but I need 2 firewood also.'
Utterance: 'no that won't work. I will give you 3 food and 1 water. I will take 3 wood and 2 waters.'
[EX A]:
No