How would you ?

To a person with no arms,
how would you greet them ?
Would you offer your hand?
Or would you stand and Look?

To a person who cannot hear,
how would you say Hallo?
Would you say something?
Or just move your Lips?

To a person in a wheel chair,
looking for a seat.
would you move a chair, and make place?
or retreat with a bright red face?

The best thing to do,
in this kind of situation.
Is to treat the person normally,
try to show "no" frustration.