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: 
Utterance: 'What are your preferences for water?'
Yes

Context: 'i'm good thank you, How are you doing today?' 'I am good, let's plan our camping trips. I am diabetes, so water is very important to me. what about you?' 'I need water too'
Utterance: 'what is the next thing you need the most/?'
Yes

Context: 'I could also use the extra food, so can we resolve it amicably?  Coin flip maybe?' 'That's a good idea.  I'll trust you to do the coin flip.  ' 'Sure.  🙂  I'll grab a coin.'
Utterance: 'Calling tails.  '

No