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: Ok. How many nights would you like to book? Sentence2: Thanks very much ! Sentence3: You are welcome! Have a good day! Sentence4: How many people will be staying? Sentence5: What are the dates you are staying? Sentence6: 4 nights please. Sentence7: Ok. Your booking was successful and the reference number is TD8TU8IO . Sentence8: I will be staying four nights starting on Friday. Sentence9: 4 people will be staying for 4 nights starting from Friday. Sentence10: I want to make a booking at the alexander bed and breakfast. Question: Who has spoken the sentence 5? (A) User (B) System
Output:
Answer: (B) System