Q: You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Sentence1: I really like British cuisine that is in the center of town. Sentence2: Sure, what are you looking for? Sentence3: I'll need to know when you want to leave or arrive. Sentence4: They're in the north end of town. Would you like to book a reservation? Sentence5: They do have free wifi and their phone number is 01223353888. Is there anything else you need to know? Sentence6: Ok, I think that's it. Thanks for your help. Sentence7: I've made your booking. Your reference number is L6STCUZA . Is there anything else I can help with? Sentence8: Yes. Are you able to make reservations for 4 people at 20:00 on Saturday? Sentence9: What area are they located in? Sentence10: We have 21 options using those requirements. Do you have a preference for any particular cuisine? Sentence11: I'm looking for a 4 star guesthouse. Sentence12: I'm looking for a place to eat in the centre in the moderate price range. Sentence13: i also need a place to stay Sentence14: No I'll take care of that later. But can you arrange a taxi for me? Going from the hotel to The Oak Bistro. Sentence15: Great! Do you have a price range you'd like to stay in or a location that you prefer? Sentence16: the acorn guesthouse is nice, when will you planning your stay? Sentence17: You are most welcome. Have a great day. Sentence18: I have you booked in a white audi to be at the Oak Bistro by 20:00. The cab contact number is 07934977306. Sentence19: do they have free wifi? And I need their phone # Sentence20: I'm looking for a place in the moderate price range and i need free parking. Sentence21: I just need to get to the restaurant for my dinner reservation on Saturday. Sentence22: One of my favorites that fits your preferences is The Oak Bistro. There food is wonderful. Is this a restaurant that you may be interested in? Question: Who has spoken the sentence 17? (A) User (B) System
A:
Answer: (B) System