U: I'm looking for a train to cambridge on Saturday.

S: Where would you be departing from?

U: I will be departing from Ely.

S: Could you leave on Friday?  There are no trains available on Saturday from Ely to Cambridge.

U: Sorry, I misspoke. I am actually departing from Broxbourne.

S: There are about 19 trains available. I can narrow that down some if you tell me if you want to leave or arrive by a certain time.

U: I would like to arrive by 15:30.

S: There are 9 trains that meet your criteria that day, one leaving every hour from 05:32. Do you have a departure time preference?

U: No, we just want to get there either at or right before 15:30, please. Can you get me 8 tickets on the closest train to that time?

S: 8 tickets for the TR7846 leaving at 09:32 your reference number is D0CG7JD3. Anything else today?

U: I'm sorry, I meant that I need 5 ticket for the train booked. Can you fix this?

S: Yes sure. I booked that for you for 5 people and the reference number is  IFXPNYHS.

U: Now that the train is settled, I need a place to stay that is in the expensive range with free parking, please.

S: There are a number of expensive hotels in town. Do you have a preference for area you'd like to stay?

U: I would prefer a guesthouse if possible.

S: I do not have any expensive guesthouses. Can I try something else?

U: Can you try moderately priced?

S: I suggest acorn guest house it is in 154 chesterton road.

U: Ok, that sounds great. Can you book that for me for 3 nights?

S: Yes. I need to know what night you'd like your reservation to begin and how many people it will be for.

U: Does it have all the amenities like breakfast and free wifi for the amount I'm paying?
S: I'm sorry. I don't have any information on specific amenities that the Acorn Guest House provides for guests.