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: It should be in the centre, , how about one that is in the type of architecture Sentence2: What sort of information do you need? Sentence3: DO you need free wifi or parking? Sentence4: Thank you! When you are done I will need the reference number. Sentence5: great saint mary's church is at market square Sentence6: The post code is cb23pq. Anything else? Sentence7: We are visiting and hoping to find some great entertainment in the area. Sentence8: Is there a price range you'd like? There are many moderate prices guesthouse, and 2 cheap ones. Sentence9: You're welcome, have a good day. Sentence10: Booking was successful at the Avalon. Your reference number is : 0BMY3Z94 . Can I help you with anything else? Sentence11: No those dont matter to me. Sentence12: What about the post code? Sentence13: There are actually 9 guesthouses on the north that are moderately priced. Would you like me to select one? Sentence14: There are a few, do you have a certain area in mind? Sentence15: The Centre has some wonderful architecture. There are several options that do not charge an entrance fee and one that charges 2 pounds. Do you have a preference? Sentence16: I'd prefer the moderate one, what is the name of it? I will need a reservation for 7 people for 2 nights starting Wednesday. Sentence17: I will work on booking this for you and be back with you shortly. Sentence18: Hi, I am looking for information in Cambridge. I'll be coming in the next few weeks. Sentence19: Yes please. I need it for 7 people, 2 nights and starting from Wednesday. Sentence20: Not really. What's the address and postcode for your favorite one? Sentence21: I need a place to stay - a guesthouse, I think. Perhaps in the north? Sentence22: That will be l for now, thank you very much Question: Who has spoken the sentence 16? (A) User (B) System
Answer: (A) User