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.

[Q]: Context: 'What are your preference what would you need most?' 'I need to keep the fire burning so i need firewood most. What about you?'
Utterance: 'I dont need the firewood as much. '
[A]: No


[Q]: Context: 'Hello. I'm looking forward to striking a deal with you that makes both of us happy!' 'Sure I am waiting too!'
Utterance: 'So tell me, which is most important to you? What can't you live without?'
[A]: Yes


[Q]: Context: 'Got it! I am going to need the most of food. There aren't any animals or berries that I feel safe eating where I'm going.' 'Well I think we can make a good deal then.  How many packages of food would you want?' 'Could we each do 3 of what we need the most? I get three food and you get three water? How do you propose splitting up the firewood?'
Utterance: 'We can do the 3 for 3 trade.  That works perfectly!  Its' going to be cold at night where I'm going.  What's it like where you're heading?'
[A]:
Yes