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: 'Hi, '
Utterance: 'Hello. What sort of supplies are you looking for?'
Example Output: Yes

Example Input: Context: 'How many of each extra package are you thinking you need?'
Utterance: 'I would prefer to take all of the firewood, split the food, and you could have all of the water.  What do you need the most?'
Example Output: Yes

Example Input: Context: 'Hello, I was hoping we can chat. '
Utterance: 'Hi there. '
Example Output:
No