What I meant to say, if you haven't done so or received it already, is to ask for the latest reissued e-ticket and make sure it has a ticket number and reflects the updated travel dates. This can be an issue with LM at times where you have an updated reservation, but the underlying e-ticket is not reissued yet or not properly reissued and that document is the only one that counts for your travel. A confirmed reservation is nice, but will not be relevant other than to prove that a change was made for you as only the e-ticket rules supreme.

If LM Support didn't email you the latest e-ticket then I would ask them to do so. YMMV.