I need a Friday train, to arrive by 19:30.
there are many trains! where are you coming from? 
I am heading to Broxbourne from Cambridge.
Is there a certain time you would like to leave?
No, I just know that I need to arrive by 19:30. 
TR2436 will arrive in Broxbourne at 19:01. Would you like me to book a ticket for you?
yes please for four people
I have you booked on train TR2436 for 4 people, your reference number is UGROZAQ1.  71.59 is payable at the station, can I help with anything else?
Yes, I am looking for an expensive restaurant to dine at earlier the same day.
Did you have a particular type of cuisine you were looking for? 
I am flexible on the cuisine. But I would like something in the centre of town that is expensive. 
I recommend Fitzbillies Restaurant.  It is an expensive restaurant in the centre that serves British cuisine.  Would you like to make a reservation?
book for the same group of people at 12:45 on the same day
I will book it for you and get a reference number