Hola: Muchas gracias. Me he alegrado mucho de leer tus explicaciones. Saludos cordiales.

"Are you waiting for somebody here?" or, "Are you waiting here for somebody?" are both correct. In written English, sentences are not supposed to end with prepositions. Technically, they shouldn't in spoken English, either, but we do it all the time. However, in written and spoken English, the two sentences above are correct.