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 can't take cold and would badly need to have more firewood.' 'I need more firewood to keep my food going.' 'I get it, in that case I'' take additional packages of food.'
Utterance: 'I don't think so, because I need additional packages of food in case there is an emergency.'

SOLUTION: No

PROBLEM: Context: 'I would be interested in firewood.  Can I ask you, what are your primary concerns on this trip?' 'My primary concerns are staying hydrated, I have been feeling sick and throwing up from being so high up in the mountains. ' 'Oh, so sorry to hear that.  I can understand why water would be important to you.  I am worried about being too cold at night. My sleeping bag is not rated well for cold weather (I packed the wring one).'
Utterance: 'Oh I understand that for sure. I am not used to the cold weather either which is not helping. Would you be interested in a trade for water in exchange for firewood? '

SOLUTION: No

PROBLEM: Context: 'I'm doing well! Just want to have some open communication on the packages for our camping trip! I'm very excited for it!' 'I'm also looking forward to it. I'm planning on going back-country camping with a lot of hiking, so my top two priorities are firewood and water.' 'Understood! My top two priorities are food and water! Am hoping we can reach a compromise on the items so that we're both happy!'
Utterance: 'That sounds great, I'm the most flexible on food. How many of the extra packages of food do you want?'

SOLUTION:
No