Task-oriented dialogue about: train

I need a train to Cambridge on Saturday. I'll be departing from Peterborough.
In order for me to find the best train to suit you, can you provide me with a preferred departure or arrival time?
We'd like to arrive by 12:45.
There are 14 trains that arrive by 12:45. What time would you like to leave?
What's the latest train I can take that will still get me there by 12:45?
The latest train leaves at 11:48 and arrives at 12:38. The cost per ticket is 13.20 GBP. Would you like to book this train?
Yes, for 7 people. Please give me reference number.
Perfect. I have booked your trip. Reference # K3MJOHZK .
Great! Thanks! That's all I needed!
Glad I could help! Have a nice day!