Half-bluff
We're not supposed to be somewhere, so we try the Ford Prefect strategy of walking past the guards and saying 'he's with me'. Naturally, this method is not guaranteed when used by uncharismatic characters.
'Give me a Bluff check.'
'Can I assist him?'
'Yep.'
'Neat. I have +9 on my Bluff check, so automatically assist anyway, but I roll... 18. +27 means I assist Salvador's Bluff check quite easily.'
Salvador's roll is excellent. 'Natural 20! Back of the net. With your +2 assist, that gives me... +21.'
We really need to start working out in advance who in the party should be doing the talking under various circumstances.