You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: thanks. the reference number is 0KSZQNWL Sentence2: On the East side please, in the same area as the restaurant Sentence3: They both have internet. Sentence4: Sounds great! May I please have the postcode? Sentence5: Which area would you like to stay in? Sentence6: I also need a place to stay and would like to fins a guesthouse with a star rating of 4. Sentence7: Might I suggest the Autumn House. It is cheap and in the east. 4 star rated and they offer free parking and wifi. What day for your reservation? Sentence8: not really. just book it for 6 people at 15:00 on monday. Get me a ref number please. Sentence9: great, i have 6 options for you! do you need parking or wifi? Sentence10: Sure! It's cb58rs . Is there anything else I can do for you? Sentence11: That's all I need today thanks for all the help. Sentence12: I have several restaurants that would work. Do you have a price range? Sentence13: Ill take the one in the East,can you book it for me? Sentence14: You are very welcome. Please reach out to us again, if we can be of further service. Good-bye. Sentence15: I need a restaurant in the east. Sentence16: I'm impartial to both, but would like to know if they have or don't have internet available. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User