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: Consider Input: Context: 'I really appreciate that. Do you think you will be okay with just 1 water since you have health issues?' 'That would be very nice, but I worry about you not having enough on the trail.  Dehydration would not be good.  I am pretty sure I can ration my supply to make it last.  🙂' 'You're a good friend! I'm excited to embark on this adventure! 🙂🙂🙂'
Utterance: 'Me too!  So let me clarify:  I will take 2 firewood, 1 water and 1 food.  You will take 1 Firewood, 2 water and 2 food.  Is that right.  🙂🙂🙂'

Output: No


Input: Consider Input: Context: 'Hello'
Utterance: 'hello, so what is your most important thing that you want? '

Output: Yes


Input: Consider Input: Context: 'Hello there' 'Hello'
Utterance: 'What kind of items do you need?  I especially need water because I would like to do extra hiking and would need to hydrate.  '


Output: Yes