As a user, I should know if my appointment request was successful

[mentalcaries]

Here we'll need to submit the information to the database. The user should get some kind of confirmation if successful, or error message if not.

AC:

• [x] Appointment info is submitted to the correct tables in the database
• [x] The user should receive confirmation of the appointment details
• [x] If the request fails, an informative error message should be displayed.