You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.
Q: Sentence1: Do you have any 3 star hotels available? Sentence2: There are no matches, would you like to check other locations? Sentence3: The soul tree nightclub is quite lively. Their postcode is cb23qf and their phone number is 01223477900. Sentence4: Thanks for recommending the Guest House. I am also looking for some town nightlife, especially a nightclub. Sentence5: I have no preference. Can you suggest one and give me their postcode and phone number? Sentence6: There are no 3 star hotels in the north with a moderate price? Sentence7: There are two hotels available; the Ashley Hotel and the Lovell Lodge. Both offer internet and parking and are 2 star hotels. Do you have a preference? Sentence8: Unfortunately, no. I do happen to have 2 guesthouses though. Both are moderate pricing and 3 stars. Are you interested in one of those? Sentence9: We have 6 nightclubs in town. Would you prefer to visit the centre or the south? Sentence10: Yes, please. Can I get a room for 4 people? We'll arrive on Wednesday and stay 5 nights. Sentence11: Hello, can you recommend a moderately-priced hotel in the North part of town, please? Sentence12: Done! You have a reservation at the Alpha-Milton Guest House. Your reference number is 9SA494XR . Can I help you with anything else? Sentence13: Thank you for using Cambridge TownInfo centre. Have a great day! Sentence14: Great, thank you! That's all for today! Bye bye! Question: Who has spoken the sentence 13? (A) User (B) System
A:
Answer: (B) System