Write a function that receives a dictionary and a key, and returns the value for that key. Implement exception handling to return a custom message if the key is not found in the dictionary.
Example 1:
Input: dictionary = {"name": "Alice", "age": 25}, key = "name"
Output: "Alice"
Example 2:
Input: dictionary = {"name": "Alice", "age": 25}, key = "address"
Output: "Error: Key not found in the dictionary."