U: I need help finding train to Lodon Liverpool Street.

S: Thank you, I see there are several to choose from.

U: I need it to arrive by 19:45 on Sunday and I'm leaving from Cambridge.

S: Train TR1163 leaves at 05:59, is that okay?

U: Yes, I'd like to book it for 3 people. Could I get the reference number as well?

S: Booking was successful, the total fee is 39.83 GBP payable at the station. Your reference number is 121NE14K. Can I help with anything else today?

U: Can you find me an expensive restaurant in the centre, please?

S: There are 33 results.  Can we narrow down by type of food?

U: I would like a restaurant that serves venetian food, please.

S: There are no expensive venetian restaurants in the city centre. Is there another food type you want?

U: Sure, how about some British food?

S: There are 3: Fitzbillies Restaurant, the Cambridge Chop House, and Midsummer House Restaurant. Do any of these sound good to you?

U: which of these restaurants have the friendliest staff?
S: The Fitzbillies Restaurant, The Cambridge Chop House have very friendly attentive staff. The staff at Midsummer House Restaurant are courteous but are a bit slow in serving guests.