Rewrite the following sentences with more formal and polite language.
Hey, what's up?
Greetings, may I inquire as to how you are doing?
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the following sentences with more formal and polite language.

### Input:
Hey, what's up?

### Output:
Greetings, may I inquire as to how you are doing?