Hal 9000 said:
What’s the source of the dialogue? Sounds familiar but I can’t place it.

https://www.youtube.com/watch?v=WvrCBRxkB8U

It’s from the episode of Droid Tales that JJ used to help write his script. Watch it, trust me…

I’m not sure what “Padme’s very first mission” would be, though.

I know, makes no sense… I planned on having him say, “…very first mission with Master Anakin” but I couldn’t make it work. I thought it would be nice to have some confirmation that 3PO witnessed what would be considered a very interesting event. 😏

Is there even some specific dialogue like “I am going with Mistress Padme to the ___ system” or something to reference TCW?

Haven’t checked, might be.