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: 'Not really! I will need you to give me 3 food, 2 water and 2 firewood.' 'Yea, that's not going to work for me. That would leave me with NO food, and only 1 water, and 1 firewood. Would you take that deal, if I offered it back to you?' 'Ok what will work for you?'
Utterance: 'I really need at least some of everything. What do you need the most?'
Yes

Context: 'Hello, I will start out by saying that I would like to have 3 water because I do not have a nearby water source. What is your situation?' 'Hello. I have a health issue that I need to stay hydrated at all times. I do understand your situation though. '
Utterance: 'How much firewood and food do you think you need? '
Yes

Context: 
Utterance: 'Hello, the trip sounds like it will be a lot of fun.  What is the most important essential package for you and your family?  I know we didnt bring a lot of food so I am looking for more of that than anything else.'

Yes