Is this sentence correct?

[jkluniv]

Is this sentence correct?
"What do you think available?"

[beascarpetta]

Could you possibly explain in which context you want to use that phrase ?
One sentence that comes to mind would be
Do you have any rooms available this weekend?

[jkluniv]

Thank you for your good advice.

When I talk to someone.

"A: What do you think available?
B: I think /this chair / available."

[beascarpetta]

When I talk to someone.

"A: What do you think available?
B: I think /this chair / available."

You'd rather say
A: Is this seat taken ? (if you wanted to sit down)

or

A: How much is this chair? (if you wanted to buy the chair)

Maybe you should have a look there