I dropped down my laptop now I am facing some difficulties to start it. can I book an appointment with you guys?

Bummer...

From your iPhone install the Apple Store app

1. Launch the Apple Store app on your iPhone, iPad, or iPod touch.
2. Tap on the Stores tab in the bottom navigation.
3. It should find the closest store to you automatically. ...
4. Tap on Genius Bar.

can I book an appointment with you guys?

No, we're just users of Apple products, like yourself. You are not talking to Apple directly.