You will be given a definition of a task first, then an example. Follow the example to solve a new instance 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 need a place to dine in the center thats expensive Sentence2: I have several options for you; do you prefer African, Asian, or British food? Sentence3: Any sort of food would be fine, as long as it is a bit expensive. Could I get the phone number for your recommendation?Question: Who has spoken the sentence 2? (A) User (B) System
Solution: Answer: (A) User
Why? The sentence 1 is said by a user because the intent of it says that the information has to be gathered from the system

New input: Sentence1: That sounds good can you book it for 4 people at 16:30 on wednesday? Sentence2: Yes. The Bedouin serves gastropub food and is in the centre of town. Sentence3: The Slug and Lettuce would be fine. It will need to be on Wednesday for 4 people. We'd like to eat at 16:30. Sentence4: Yes, I would prefer to stay in the south. Sentence5: Okay, I've got it booked for you for 4 people for 3 nights starting on Wednesday. The reference number is: HRT9EL5L . Is there anything else I do for you? Sentence6: That is all I need to know. Thanks. Sentence7: You're all set. Your car will be a white toyota. If you need to contact the driver, you can call 07073603005. Sentence8: You are welcome, just let me know if you need anything else. Sentence9: Yes what time would you like to travel by taxi? Sentence10: i am also looking for a place to stay. The hotel should be in the cheap price range and should include free wifi. Sentence11: Okay, you're all booked. Your table will be reserved for 15 minutes and your reference number is 32V8AA4N . Is there anything else I can help you with today? Sentence12: Is that a gastropub? Sentence13: I apologize the Bedouin serves african food. Could I recommend the Slug and Lettuce, or backstreet bistro, if you would prefer something moderately priced the cow pizza kitchen and bar. Sentence14: Cambridge has 10 options that meet your criteria. Is there a particular area in which you would like to stay? Sentence15: I'm looking for somewhere to eat in the centre. Sentence16: I would like to arrive in time for our booked time at the Slug and Lettuce. Sentence17: The bedouin is a nice choice. Do you want to book ? Sentence18: Rosa's bed and breakfast is a guesthouse in the south, with a 4 star rating, free wifi and cheap price range. Would you like a reservation? Sentence19: Yes, please book a stay for 4 people, 3 nights, starting on Wednesday. Sentence20: Can you also book a taxi for me between the guesthouse and the restaurant? Question: Who has spoken the sentence 18? (A) User (B) System
Solution:
Answer: (A) User