I can't tell the episode, but it's in SW.com's soundboards.

Regarding the dialogue, what about:

Obi-wan : "Anakin, do you copy? The chancellor signal is coming from right there"

Anakin : "This is where the fun begins, master. I'm glad that you chose to serve.

Obi-wan : "I knew you would say something like that " (if possible, if not, we'd have to figure out something else).

Anakin: Don't worry. Take a deep breath.

little pause

Anakin : "Obi-wan... may the force be with you" [with us would be even better]

Obi-wan : "thank you brother, may the force be with you"

"This is where the fun begins" is a line you could add to the dialogue, however if you don't, it just wouldn't affect the rest of the dialogue).

Regarding "I know you would say something like that", in this structure of dialogue I've made, it's a rather important piece.

I have put "..." between "ObiWan" and "may the force be with you" because, the way I'm immagining it, it implies Anakin cutting the joking and speaking seriously. This could be even boosted more with some minimal change in the score (if you decided to put the dialogue during the flyby and not at the very beginning of the movie.