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: 
Utterance: 'Hi. I'm most interested in water. What's your highest priority?'
[EX A]: Yes

[EX Q]: Context: '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.' 'no that won't work.  I will give you 3 food and 1 water.  I will take 3 wood and 2 waters.' 'I did not know you wanted water. Ok, that's great so I will take all 3 extra packages of food.As for the water I would like 2 waters because my dog is coming along with us for our trip and extra water for him will be needed.'
Utterance: 'i think i should have 2 waters because i will need to put the fire out to protect the forest.'
[EX A]: No

[EX Q]: Context: 'Hi! I was hoping to get 2 packages of firewood, 2 packages of water and 1 package of food and you can have the rest.'
Utterance: 'Hello. Is there a reason you prefer more water and firewood to food?'
[EX A]:
Yes