“I would be available to attend an interview”

Question

I would be available to attend an interview on any day at your earliest convenience.

This is the last paragraph of a letter of application. Could you explain to me why is "would" used instead of "will" that normally indicates the future.

Answer 1

"Would" is hypothetical. It means that if they offer an interview, then you will be available.

Answer 2

In addition to what Gabriel told that would is hypothetical, its also used to be a little more polite with the person you're talking to. Source : Difference Between Would and Could