U: Are there trains leaving Cambridge after 18:15?

S: Yes. Can you help me narrow down the choices with a day to leave and destination?

U: I'm looking for one that goes to Stevenage on Saturday.

S: I have a train leaving at 19:21 and arriving at 20:10, if that works.

U: Yes, can you book three tickets on it, please?

S: Booking was successful, the total fee is 30.72 GBP payable at the station .
Reference number is : S74F7IZS.

U: Great! Can you help me find a cheap restaurant that serves the americas food?

S: I do not show any restaurants that fit that criteria. Do you have any other preferences?

U: I just need something with American food.

S: I have found Gourmet Burger Kitchen, they serve north American food, although they are expensive. Would you be interested in booking here?

U: Does Gourmet Burger Kitchen offer great service?
S: There were multiple comments that the service at Gourmet Burger Kitchen was mediocre, but there was also a comment indicating that the service was great.