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

Sentence1: Would you like to look into a hotel? Sentence2: bridge guest house is a 3 star guesthouse in the south part of town with free parking and wifi. Can I book it for you? Sentence3: TR4748 deperts at 13:17 and arrives 14:08 Sentence4: The travel time for TR4748 is 51 minutes. Sentence5: thanks! what is the travel time? Sentence6: You are very welcome. Good bye. Sentence7: I am going to Cambridge and arrive by 18:45. I need the train ID, travel time and departure time. Sentence8: I am planning a trip in Cambridge. Sentence9: Yes, please book that one. Sentence10: I'm sorry, I don't need to book it at this time but could you please provide me the phone number to Bridge guesthouse? Thanks Sentence11: uhm, no. that's your job, weirdo. also, i need a train. Sentence12: Thanks you too! Bye! Sentence13: Have a great day. Sentence14: Yes I would like to book that one. Sentence15: Where will you be travelling to? Sentence16: Ok, I do need a hotel after all. I need 3 stars and it should be moderately priced. Sentence17: There are some lovely 3-star guesthouses in Cambridge. Which area would you like results for? Sentence18: I don't have a preference. Why don't you pick one for me. Sentence19: Thank you. That is all that I need for today. Sentence20: 01223247942. What other info may I provide about the Guest house? Question: Who has spoken the sentence 5? (A) User (B) System
Answer: (B) System