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, please book this. Sentence2: I found 4 restaurants, would you like to try Cotto? Sentence3: Thank you, can I also get a train leaving petterborough and arriving by 11:15 Sentence4: That's all I need, Thank You. Sentence5: Sure, can you try to get a table for 8 people at 17:00 on Tuesday? Sentence6: Okay... how about British food? Sentence7: Booking was successful. The table will be reserved for 15 minutes. Reference number is : IAUXALYD . Sentence8: I just need to make sure I arrive in cambridge by 11:15 please. Sentence9: I would like to try Jamaican food. Sentence10: Unfortunately I can't find any Jamaican restaurants. Is there another type of food you'd like to try? Sentence11: Absolutely. How many tickets would you like to be booked? Sentence12: There are 21 different restaurants in that area matching your price range. What kind of food are you in the mood for? Sentence13: I'm looking for a moderately priced restaurant in the center of town. Sentence14: Sure thing! The reference number is S4FM08GE . See you! Sentence15: There is a train that leaves at 10:19 and arrives at 11:09. Would you like to book it? Sentence16: there are eleven trains that match that criteria. What time would you like your departure time to be? Sentence17: Yes, Tuesday, the same day as the restaurant booking, can I please get a departure time as well? Sentence18: Before going further I would just like to confirm you'd be leaving on Tuesday, is that correct? Question: Who has spoken the sentence 16? (A) User (B) System
Answer: (A) User