Detailed Instructions: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Not yet but I also need a restaurant that serve mediterranean food and should be in the centre of town. Sentence2: I need a train to Broxbourne, that arrives by 20:30. Sentence3: I have the TR8991 leaving at 19:01 and arriving by 20:01. Would you like me to book that for you? Sentence4: There is a train leaving at 5:01, would you like a seat? Sentence5: Tell me about The Gardenia. Sentence6: You're welcome. Have a wonderful day! Sentence7: Is that leaving on Sunday? Sentence8: No, that's it for now. Thanks for your help. Sentence9: Certainly. Can I assume you're leaving from Cambridge? Sentence10: It's a cheap restaurant located at 2 Rose Crescent City Centre. Phone number and postcode are 01223356354 and cb23ll. Do you need anything else? Sentence11: I have a few restaurants that fit your criteria. The Gardenia, La Mimosa, and Shiraz Restaurant. Which one are you interested in hearing about? Sentence12: Yes, that is correct. Question: Who has spoken the sentence 4? (A) User (B) System
A:
Answer: (A) User