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.

[EX Q]: Context: 'I need food and firewood' 'I need water and then firewood' 'You can have all the water if I can have all the extra food'
Utterance: 'OK, but first tell me why you need extra food'
[EX A]: Yes

[EX Q]: Context: 'Hello, I want to keep 3 packages of the water and 2 packages of the food and 1 package of the fire wood , and you can keep 1 package of the food and 2 packages of the firewood.'
Utterance: 'Could I get 1 package of the water just to be entirely safe?? I really appreciate the 2 packages of firewood as it has been very wet and rainy where I will be going.  There will be a lot of standing water, so my chances for having safe water to drink might be a little iffy.'
[EX A]: No

[EX Q]: Context: 'Hello how are you?' 'Hey there fellow camper! I am great! How are you?' 'I'm doing well and very excited about my camping trip.'
Utterance: 'Me as well. What item is your greatest priority for your trip?'
[EX A]:
Yes