I need a train from cambridge to ely. No problem. What day will you be leaving, and is there a particular time you would like to board? Yes, I need to leave on Friday sometime after 15:30. I have a train that leaves Cambridge at 15:50 and arrives in Ely at 16:07, would you like me to book it for you? Yes, I also would like the reference number. Sure thing. The number is FAC22HSG . Anything else I can do for you? I'm sorry, I forgot to specify that I need 6 tickets. Could you change that for me? Surely, I have made that change and the new reference number is YWF1K74N . Is there anything else I can do for you?