Given the task definition and input, reply with output. You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Yes I need to leave broxbourne after 13:15. Sentence2: yes book please for 1 Sentence3: Unfortunately, the only multiple sports attraction is in the east. Can I look up some other attraction for you? Sentence4: Thank you. Can you also recommend places to go in the centre of town that involves multiple sports? Sentence5: The postcode is cb21sj. Sentence6: TR8199 will leave at 13:32 and arrive by 14:42. Do you require more information or would you like to book? Sentence7: Booking was successful, the total fee is 17.89 GBP payable at the station .Reference number is : JWI85JQG .is there anything else i can be of help? Sentence8: I have a lot of trains. Do you have a time of day ? Sentence9: I hope you have a wonderful day as well. Goodbye! Sentence10: Do you have any trains heading to Cambridge on Tuesday? Sentence11: No thanks you were great! Have a good day. Sentence12: How about a museum in the centre of town? Sentence13: I'd recommend primavera on 10 king s parade. Would you like more information on it? Sentence14: Sure thing! Can I help you with anything else? Sentence15: Thanks for your help! Sentence16: I need the postcode. Question: Who has spoken the sentence 6? (A) User (B) System
Answer: (A) User