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: 'I am hoping to receive 2 packages of food so that way you also have 1. ' 'That sounds great to me. I'm hoping to get 2 firewood, 1 water, and 1 food out of the deal. I'm amicable to more discussion though.' 'This also sounds like a fair deal to me! I am happy that we have reached a compromise so quickly on the packages based on our needs! '
Utterance: 'Me as well! I'm glad we could come to such a comprimise.'
No

Context: 'I could give you 1 water for 1 firewood, most of my firewood got wet so is almost useless . Would you perhaps except some food for another unit of firewood?' 'Oh. Let do some deal. If you give me all water bottles I will give you 2 firewood. Can you accept this' 'i could give you 2 water bottles and 3 food if you can do 3 firewood'
Utterance: 'OK. Are you need Extra food packages?'
Yes

Context: 
Utterance: 'Hey!  I hope you're having a good week and staying well.  So we are negotiating on supplies! 🙂'

No