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: Yes, I am going for luxorious today. I need to find an expensive restaurant in the centre. Sentence2: Sure. Train TR5476 leaves Cambridge at 18:40 and arrives at Stansted Airport at 19:08. Would you like me to book that for you? Sentence3: What is the travel time for that one? Sentence4: Sounds good. Can you reserve me a table for 8 people on Wednesday at 13:15 please? Sentence5: Your reservation at Clowns Cafe for this wednesday at 13:15 for 8 people was successful. Your Reference number is : XLDDAGQJ . Sentence6: Anything else you need today? Sentence7: I'd prefer Italian food please. Sentence8: I need a train to stansted airport on Thursday that arrives by 19:30. Sentence9: Thank you very much! Sentence10: d recommend clowns cafe Sentence11: There are a lot to chose from what type of food do you want to eat? Sentence12: No, I was hoping for a recommendation. Sentence13: We have 4 matches in the centre area of the town. Do you know the name of the place by any chance? Sentence14: nope you have been great! Sentence15: It's 28 minutes. It's very fast. Sentence16: Thank you. Enjoy your dining experience and don't hesitate to call again. Have a great day! Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User