Definition: 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.
Input: Context: 'That is a problem. Does the medication require the use of fire or firewood as well?' 'No, of course not. You can have the extra of those if you'd like. It is really the water that is the most important to me. ' 'Hmmm... I don't really need the firewood,just the food which you are offering and the water. '
Utterance: 'Okay, can I have the 2 waters and 2 firewood then? I will give you all of the food, and 1 of the water. Do you need any firewood at all?'

Yes