There is no ticket number. Here is part of the email thread to email@example.com:
On Jun 15, 2014 2:47 PM, "Eilyn Guan" <firstname.lastname@example.org> wrote:
Thank you very much. That will be wonderful. Please assist to book us on train 318 on 09 July.
Thank you once again.
On Jun 15, 2014 1:27 AM, <email@example.com
I can book you on train 318 leaving Milano @ 1425 arriving into Chiasso @ 1508 on 09 July for a total of €18 for the 2 passengers. This will allow you about an hour layover in Chiasso to do what you need to do before boarding train 258. However, I am going to recommend that before boarding the new train in Milano, you should stop at the ticket window in the Centrale station in Milano to advise them you will be boarding the train in Chiasso instead of boarding the train in Milano. This way the conductor will not give your seats away on the original train.
Please let us know if you want us to book the earlier train from Milano>Chiasso, and that you approve us charging the additional cost to the card on file.