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: 
Utterance: 'Hello.  What are your preferences for extra items for your camping trip?'

SOLUTION: Yes

PROBLEM: Context: 'I have the same needs. I have a low metabolism, so I need food and firewood to keep me warm and energized. Water I plan on filtering elsewhere.' 'Ok, well, I'd like to help. How about if I take 2 food and 1 firewood and 2 water, and you can keep the rest?' 'Would you mind if you got 3 food and 1 water and I got 3 firewood and 2 water?'
Utterance: 'I'd like some firewood though... Would 3 food and 1 firewood for me work?'

SOLUTION: No

PROBLEM: Context: 'Nice. Same, it's over 100 degrees where I live. 🙂' 'Yikes! It's a bit colder up here, that's why I would like to bring some extra firewood to stay warm at night.' 'Oh, I see what you did there. No problem I have plenty of firewood for you buddy. 🙂'
Utterance: 'Great! What extra supplies would you like to bring?'

SOLUTION:
Yes

