Sam rose an eyebrow, she was made to look more humanoid, act more human.. She didn't really announce that she was mechanical. Without being told, it was nearly impossible to tell. She looked, felt, and acted human... For the most part.
"Don't be so quick to assume." Sam retorted, "He explained why he is here; he activates when situations such as our crash occur." From this point, any kind of help would be good help.
"They call me Sam." she introduced herself.