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: OK - what day and time do you want to travel? Sentence2: The departure time is all I need. Sentence3: I am wanting to go from Stevenage to Cambridge. Sentence4: I need to find a train. Sentence5: I don't care, anywhere in town is fine. Sentence6: Have a nice day. Sentence7: I would like to go to a theatre in town. How many are there and where are they? Sentence8: What area in town would you like to go to? Sentence9: I am glad we were able to help you today. Have a good day. Sentence10: Okay- from where to where? Sentence11: i suggest the junction. it is in south. can i give you the address? Sentence12: No, thank you that is all. Sentence13: Sure. What is the Address, phone number and postcode? Sentence14: The TR4800 meets your criteria. How many tickets would you like? Sentence15: The address is clifton way and the postcode is cb17gx. Their phone number is 01223511511. Do you need anything else? Sentence16: I want to leave on Friday and should arrive by 10:45 Question: Who has spoken the sentence 13? (A) User (B) System
Answer: (B) System