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: I want to leave the hotel at 23:15, a midnight swim would hit the spot. Sentence2: Can you find me a spot to stay with free parking and a 4 star rating? Sentence3: Can I look up anything else for you? Sentence4: No but I do need the phone number and address. Sentence5: I have 4 different swimming pools in town. Is there an area of town you'd like one in? Sentence6: Booking completed! Booked car type : black volvo Contact number : 07411725780 Sentence7: I have no preference. Can you pick one for me? I'll need the postcode and phone number please. Sentence8: What time would you like the taxi? Sentence9: Thanks. Can you get me a taxi between the guesthouse and the swimming pool please? Sentence10: Is it a guesthouse and in the moderate price range? Sentence11: Have a nice day. Sentence12: I also need the name of a swimmingpool in town. Sentence13: No that's all, thank you. Sentence14: Sure, the address is 52 gilbert road and the phone number is 01223575314. Can I help you with anything else? Sentence15: That is all I need. Sentence16: Yes it's a moderately priced guesthouse located in the north. Would you like me to book you a room? Sentence17: parkside pools is located in the centre. The phone number is 01223446100 and the postcode is cb11ly. Sentence18: The Archway House is a four star hotel with free parking. Will that work? Question: Who has spoken the sentence 11? (A) User (B) System
Output:
Answer: (B) System