Please find a train that departs from Peterborough and arrives in Cambridge by 8:45. 
Okay, and which day would you like to travel?
I would like to leave on Saturday from london liverpool street
The TR3390 arrives Saturday at 8:38.  Would you like me to book it for you?
Can I get travel time and price first, please?
The trip is 50 minutes long and it is 13.20 pounds for a ticket.
Ok thanks, Im ready to book.
Great, I have booked your ticket, your reference number is : 9LLWMNOM. May I help with anything further.
I'm so sorry.  I didn't mean to book yet.  I won't need that reservation.  Could you make sure that train TR3390 is departing from London Liverpool?
Train TR3390 is departing from peterborough to cambridge. Would you like me to look for a train departing from London Liverpool?
Yes, please. I need to know the price and travel time for that as well.
TR7397 leaves from London Liverpool Street on Saturday at 05:39 and arrives in Cambridge at 07:07 with travel time of 88 minutes. Cost is 13.28 pounds. Shall I book this ticket?
No, thank you. That's all I needed today.
Thank you, goodbye.