People spend lot of money in marketing services but they put it like 'call to action' if they don't offer online appointment booking. With online booking, put it out for patients as 'Call to office' anytime, anywehere. Whether it is late in night, early morning or need an urgent appointment due to pain.
Do not loose potiental patient to someone who offers Online appointmnet booking. Young generation today prefers more actions, less words. Use this feature to convert website visits to appointments.