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.

Example Input: Context: 'Well I am going to have to think about this deal. Perhaps I can contact my friend and see if he can get some extra water. He is a big eater so the food may come in handy. ' 'That would make things better for me.  ' 'Can I ask you why you need so much water for one person? '
Utterance: 'Hiking in the summer, I sweat a lot and I don't want to risk getting dehydrating and sick out in the woods.'
Example Output: No

Example Input: Context: 
Utterance: 'Hello! Which item do you need the most?'
Example Output: Yes

Example Input: Context: 'You mean you can't let up one firewood for me?' 'Not this time, I really need all the firewood and food is a large need for my family of 8. We need the firewood to cook all our meals from the animals we hunt since we are short on food.' 'But these are only additional packages☹️'
Utterance: 'I get that and understand completely. I have a large number of mouths to feed making the food a necessity or all the firewood to cook whatever we hunt. How many you have?'
Example Output:
Yes