[He almost misses it when the TARDIS answers, if only because he was expecting something a bit more... well, no. One of her dear pilots had left. How else would she be acting?]

Hello. [His voice is calm and low, soothing and comforting, as best as he can be.] Figured I'd check in with you, see how you're doing.

I know I always hate when I lose sight of you while travelling. Guess its even worse from your end, sometimes. [He pauses, just for a moment] Do you need anything?