U: Hello, I'm looking for a train out of Cambridge.

S: What day would you be traveling and where would you like to go?

U: I would be leaving on Friday and i would be traveling to London Liverpool street and i would like to leave after 21:15

S: You could take the TR9557 at 21:59, or the TR3138 two hours later.

U: I'll take the earlier train. could you tell me the travel time, and at what time I will be arriving at London Liverpool street?

S: Sure, the travel time is 88 minutes and you will arrive at 23:27. Would you like me to book the train for you?

U: That would be great, thanks. I am also looking for a hotel. I would prefer a 3 star hotel. I do not need parking.

S: Certainly. I have many hotels matching that description. Do you have a preference for what area you stay in?

U: I don't really care. Could you please find me a moderately priced one, though? I'd like a 3 star if possible.

S: Excellent, we have 4 options, all 3-star and moderately priced. They only differ by location (north, south, west) and wifi availability. Do you have any preferences given this new information?

U: I would really like a guesthouse. Is one of those a guesthouse?

S: Yes, Alpha-milton guesthouse is a 3 star in the north in a moderate price range but no internet. Does this hotel interest you?

U: Are the rooms clean?
S: Reviewers of Alpha-Milton Guest House were disappointed that the cleanliness of the rooms did not meet their expectations. Would you like me to check on one of the other options?