TASK 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.
PROBLEM: Context: 'I'm sure we can come to some compromise. I know my sister and I want to make s'mores in the evening. How about I get 2 food and 1 firewood, 1 water and you get the rest? ' 'I love s'mores.  Food is my number one concern though.  If I'm only getting 1 of the food I really need all of the water.  How does that sound?' 'So I get only 3 packages? 2 food and 1 firewood? '
Utterance: 'Do you need more firewood?  I could compromise there.'

SOLUTION: Yes

PROBLEM: Context: 
Utterance: 'Hello, are there any of the three items that you want to be sure you have enough of? 🙂'

SOLUTION: Yes

PROBLEM: Context: 'That sounds rough. 😮 I don't mind sharing out the food, I just need firewood.' 'That's great! Can I offer 2 packages of firewood in exchange for 2 packs of food?' 'Yes, that sounds good to me!'
Utterance: 'How about water? do you need? I can offer 2 of these for 1 pack of food'

SOLUTION:
Yes