You will be given a definition of a task first, then some input of the task.
You are shown a conversation between a user and system. Identify who has spoken the indicated sentence based on the conversation.

Sentence1: I booked a red Skoda to pick you up and get you to Curry for your reservation. The contact number is 07087653240. Can I help with anything else? Sentence2: Terrific, thanks and have a great day! Sentence3: That sounds fine. Does it have actually street address? Sentence4: Thank you for using the Cambridge TownInfo center, and I hope you enjoy your time in our city! Sentence5: Please book a table for 3 at 15:30 on Saturday. Sentence6: Would you like a free one or a paid entry one? Sentence7: Great! Your reference number is QMHALXPG, is there anything else I can do? Sentence8: Can I get a taxi from the place to the restaurant, I would like to arrive by the booked time of 15:30. Sentence9: Ok. Could you help me find an Indian restaurant around there which serves Indian food, Sentence10: I am ok with either option. Choose one you think I would enjoy and let me know the address and postcode. Sentence11: No preference for price range, but would like to have availability on Saturday. Sentence12: I would suggest Curry Garden. If you tell me the time you would like booked and how many will be in your party, I'll check availability for you. Sentence13: I have 9 indian restaurants in the centre. Is there a price range you would like? Sentence14: That is the only address information I have, but if you have trouble finding them, you could call them at 01223334900. Sentence15: Howdy! I'm looking to visit some colleges in the city centre if there are any. Preferably ones near food. Sentence16: How about the Christ's College in the Center located on Saint Andrew's Street, postcode cb23bu. It has free admission. Question: Who has spoken the sentence 4? (A) User (B) System
Output:
Answer: (A) User