Definition: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Input: Sentence1: Thank you for using our system today. Sentence2: Thanks so much you have been great! Gold stars for you! Sentence3: I'd like one that leaves after 10:45 Sentence4: There are trains going to Leicester at 21 minutes past the hour, every hour, starting at 05:21. What time would you like to travel? Sentence5: I would prefer Lebanese food. Sentence6: I also need as train going to leicester. Sentence7: TR5908 leaves Cambridge at 11:21 and arrives in Leicester at 13:06. Will that work for you? Sentence8: yes for 3 people at 13:45 on wednesday and a reference number bplease Sentence9: Yes I have Asian, British, International, European and Italian to name a few. Any preferences? Sentence10: I'll be leaving on Thursday Sentence11: I'm looking for a place to dine in the moderate price range in the centre, please. Sentence12: There is Ali baba restaurant in the centre in modest price range. Would you like me to book a table for you? Sentence13: Ok, great. What day will you be traveling? Sentence14: I was able to book you for 3 people on Wednesday at 13:45. Your reference number is X1ZSIHLS . Can I help you with anything else? Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User