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: No, the location is flexible. Can you tell me if Rosa's offers free parking or wifi or both? Sentence2: Yes please. I need to book it for 7 people. Can I please get the reference number after it's booked? Sentence3: I'll need to travel on Sunday, from Cambridge to Broxbourne, and I'd like to arrive by 10:15 please. Sentence4: I need a train to Broxbourne. Sentence5: Yes I need it for Friday for two nights for 7 people please. I will also need the reference number. Sentence6: All set- your reference number is 9ZLD8Y9E . Can I help you with anything else? Sentence7: TR4249 leaves at 06:01 and arrives at 07:01 giving you plenty of time. Can I book that for you? Sentence8: I want it to have star of 4, and include free wifi. It doesn't need to have free parking. Sentence9: Do you have a preference for the area, stars, internet or parking? Sentence10: No thank you. That is all. Have a good night. Goodbye Sentence11: There are many trains available. Will you be traveling on a certain day or at a specific time? Sentence12: goodbye, and you're welcome Sentence13: Does location matter? The Alexander is a popular choice in the center, but Rosa's is a favorite in the south. Sentence14: Yes, Rosa's Bed and Breakfast provides free parking. Would you like me to book that for your? Sentence15: I have it booked for you. The total fee is 100.24 GBP and the reference number is JIXSCT7D . Is there anything else I can help you with? Sentence16: Yes, I need a cheap place to stay. Question: Who has spoken the sentence 7? (A) User (B) System
Answer: (B) System