U: I need a train on Friday from the london liverpool street station.

S: There are 10 trains leaving that station on Friday. What time would you like to travel?

U: The train should leave after 17:15 and should go to Cambridge.

S: There are 4 trains that leave after 17:15. The TR9886 leaves at 17:39 from london liverpool street. Would you like me to book you a seat?

U: What is the arrival time?

S: That train arrives at 19:07.

U: Okay I would like to book it. I'm also looking for a restaurant on the cheap side in centre.

S: I found 15 restaurants, do you have a preference of food choice?

U: I really don't- it just needs to fit 8 people at 20:00 on Friday.

S: I'm unable to find an opening that fits your needs. Would you like to choose a different time or day?

U: How about for 19:00 that day? And can I have the reference number please?

S: Booking was successful for charlie chan's for Friday at 19:00. The table will be reserved for 15 minutes. The reference number is POUAEXHL. Do you need further help with anything?

U: What is the atmosphere like at Charlie Chan's, and is it a positive one?
S: It is said that customers would recommend the place as long as the atmosphere is not important to you.