Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: The Oak Bistro is my favorite. Do you need their information or can I reserve a table for you? Sentence2: Thank you! I'm also looking for a place to stay, ideally a 0 star in centre as well that includes free wifi. Can you help me with that? Sentence3: Yes, I can assist you with that. What time would you like to leave to the restaurant? Sentence4: Your room is booked for 3 nights at El Shaddai, reference number is XBYOBYV7 . Can I help you with anything else today? Sentence5: Yes, please recommend one. Sentence6: I would like to have British food. Does Yippee Noodle Bar offer British food? Sentence7: Alright, I have your taxi booked for you. It will get you to the bistro by 15:30. Your car will be a red Volkswagen. Do you need anything else? Sentence8: Yes I will need a taxi to drive between the hotel and restaurant. Can you help me with that as well? Sentence9: El Shaddai is a guesthouse that meets your needs, and Cityroomz is a hotel. Would you like to book a room at one of those? Sentence10: Just the contact number for the taxi, please. Sentence11: You are planning your trip in Cambridge. You are looking for a place to dine. The restaurant should be in the centre and should be in the moderate price range Sentence12: Please reserve it for 2 people at 15:30 on thursday and give me the reference number. Sentence13: Great. I have booked your table. The reference number is LU8KXXPR . Sentence14: Okay how about Yippee Noodle Bar? If you'd like I can book a table for you. Sentence15: The contact number is 07413487681. Enjoy your stay in Cambridge! Sentence16: No, Yippee Noodle Bar does not serve British food. However, there are four British restaurants in the area I could refer you to. Sentence17: Either would be fine, I guess whichever has available rooms for 2 on Thursday and we will be staying for 3 nights. Sentence18: I just needed to arrive at the restaurant by 15 :30 Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User