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: Certainly. I have booked you for Saturday at 16:45 for 3 people The Slug and Lettuce. Will there be anything else I can assist you with today? Sentence2: I am sorry. I went to get the reference number and now the system is not providing a reference number. I can look for another restaurant. Sentence3: I'd like to book it for 3 people at 16:45 on Saturday. Sentence4: Yes it is in the centre area. Sentence5: Could I get a reference number please? Sentence6: I'm trying to find a restaurant called The Slug and Lettuce. Do you know where that is? Question: Who has spoken the sentence 2? (A) User (B) System
Output:
Answer: (A) User