You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: Yes, I'd like to leave Thursday, what are the departure times and travel times? Sentence2: That's not necessary. I need a place to stay too. Sentence3: No thank you that was all I needed. Good bye. Sentence4: Thank you and enjoy your stay. Sentence5: The first leaves at 05:29 and the last pulls out at 13:29. How many tickets please? Sentence6: Would it be possible to book it for eight people for four nights? Sentence7: Okay, do you know what sort of place you want or where located? Sentence8: When will you be departing and where will you be departing from? Sentence9: Sounds great. Can I get more information on finches bed and breakfast please? Sentence10: There 35 trains to choose from, do you have a preference on a date and departure time? Sentence11: On Sunday, please. Sentence12: I need to leave from Cambridge and arrive by 14:30 in Bishops Stortford. Sentence13: I need to find a train to bishops stortford please. Sentence14: I need a hotel in the west , free parking is not necessary but it should be rated 4 stars. Sentence15: Okay, when would you like to begin your stay? Sentence16: How about finches bed and breakfast? They are in the west and have an excellent 4 stars. Free internet and parking! Sentence17: Booking was successful. Reference number is : JFMQZLIX . Is there something else I can assist you with? Sentence18: Finches address is 144 thornton road, postcode cb30nd. May I book it for you? Question: Who has spoken the sentence 16? (A) User (B) System
Output:
Answer: (A) User