Taking Bookings in Facebook
Step 2 - Edit your Facebook Page's call-to-action button:
A) From your News Feed, click 
Pages in the left menu.
B) Go to your Page.
C) Click the call-to-action button below your Page's cover photo and select Edit Button.
Click the call-to-action button below your Page's cover photo and select Edit Button.
D) Select "book now" option
E) Select Link to website option
F) Insert your booking link and you now are ready to take bookings from Facebook!