Declining MissionsFollow

Hi folks, very simple question - I've just started and am busy working my way through the Tut missions. I got to a stage last night where I had a mission screen in front of me, asking me to accept or decline, but I had to get to bed.

Understanding that I can't decline missions from the same agent twice in a 4 hour period, I figured it was ok to decline and leave the mission till later.

Problem is that the way the agent responded appeared to insinuate that because I declined the mission, it wouldn't be available anymore, and that she'd have something else for me later.

Now, did I just misinterpret what she said, and everything's cool, or should I rather have "Delayed" the mission (yeah, I now know that's the way to do it) till later, as declining it means it's no longer available to me.

I guess I could find out later on tonight when I log on, but to avoid running around in circles trying to get it working, I figured I would come out and ask, just in case you guys have any basic wisdom to share about running missions.