You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I would be more than elated to book a table for you, but what day and time would you like it for? Sentence2: I'd recommend clowns cafe. Would you like reservations? Sentence3: their post code is cb11ly Sentence4: I need the table for Tuesday at 14:45, but if for some reason Tuesday doesn't work Sunday is also acceptable. I will need the reference number as well. Sentence5: 01223355711 is your reference number. May i help you with anything else? Sentence6: I cannot locate the restaurant you are speaking of. Sentence7: I would like Italian food, if possible. Sentence8: No, that was everything. Thank you! Sentence9: Thank you for contacting us. Have a great day! Sentence10: I also need an expensive place to dine in the mid of town. Sentence11: it is called parkside pools. find me their post code. Sentence12: I am sorry, i'm looking for a attraction called parkside pools not a restaurant. Do you have their postcode? Sentence13: I wanted to find out about local restaurants in Cambridge. Sentence14: kindly be more specific Sentence15: that will be ok once you find the restaurant book a table for 6 people Sentence16: There are 33 restaurants with your requirements. What type of food do you feel like eating? Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System