修改給定的函式以接受兩個引數。 輸入：
def greet_customer(param1, param2):
    return "Welcome!"
已經給出的函式已經接受兩個引數`param1`和`param2`。如果您想使用這些引數，可以這樣修改它：

```python
def greet_customer(name, time_of_day):
    """
    Arguments: 
        - name: str, the name of the customer 
        - time_of_day: str, the time of day (e.g., morning, afternoon or evening)
    Returns: 
        A friendly greeting to the customer
    """
    return f"Good {time_of_day}, {name}! Welcome!"

# Example usage:
print(greet_customer("Jane", "morning"))
```