Yes, BOOKING is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, O 1, K 5, I 1, N 1, G 2.

Is it a valid word?

BOOKING is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

employment for performers or performing groups that lasts for a limited period of time
the act of reserving (a place or passage) or engaging the services of (a person or group)