ID: Approach the woman, casually.

You silently wait for the woman to move to the next table, and then the next, until she's close enough that you don't have to move very far. Convenient! "Hey there, are you busy at the moment?" She continues to face away from you, folding the rag she's been wiping tables down with. "I-" She stops herself from speaking, sighing. "No, what can I do for you?" She still hasn't turned around.