Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: We have 21 entries that match. Do you have a preference on type of food? Sentence2: I guess we could move it an hour earlier, if that's better? Sentence3: No problem. Happy to help. Sentence4: Yes please. I need a table for 3 at 18:45 on a Tuesday. Sentence5: I'd like Lebanese food please. Sentence6: I want to find a moderately-priced restaurant in the centre. Sentence7: That worked. You have a table at 17:45 with reference number 2S4UXXS3 . Can I help with anything else today? Sentence8: I was unable to find you a table at that time. Is there another time that would work for you? Sentence9: That's all I needed. Thanks for your help. Sentence10: ali baba serves lebanese food in the town centre at a moderate price range. Would you like to make a booking? Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User