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: Okay thank you so much! Sentence2: There is one place, City Centre North B and B. It is a guest house that has internet and parking available, is cheap, and is at 328a Histon Road. Sentence3: Yes, I need a restaurant that serves sri lankan food in the same area. Sentence4: That's OK, can you look for an Italian food restaurant. Sentence5: There's da vinci pizzeria in the north located at 20 Milton Road Chesterton. Would you like me to book a reservation for you? Sentence6: What is the phone number and post code for that B and B? Sentence7: There are no sri lankan restaurants in that area. Is there another type of food place you'd like to try? Sentence8: The phone number is 01223312843 and the postcode is cb43ht. Do you need anything else? Sentence9: Thanks, please let me know if you need anything else. Sentence10: No, thank you! Sentence11: Can I help you with anything else? Sentence12: You are very welcome. Have a great day! Sentence13: I am looking for a place to stay in the north with a 0 star rating. Sentence14: No that will be all thank you Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System