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: '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.  '
Example Output: Yes

Example Input: Context: 'Hi we would like you to consider giving us all of the rations for the trip.' 'hello, that could be a good idea, but I think I need more rations'
Utterance: 'How important are they to you? We would like to get a good mix, preferably more food.'
Example Output: Yes

Example Input: Context: 'Hi.  I am looking at possibly taking 3 of the food packages, 2 of the water packages and one of the firewood.  '
Utterance: 'Hi. Why do you need so many food packages?'
Example Output:
Yes