<s>[INST] This problem does not follow the format requested. However, I will provide the necessary information.

Problem: Define a function called `greet` that takes two parameters, `name` and `age`. The function should return the greeting string "Hello, my name is [name] and I am [age] years old."

Here is my attempt:

```
def greet(name, age):
    """Returns a greeting string."""
    return "Hello, my name is " + str([name]) + " and I am " + str(age) + " years old."
```

However, the test is failing with the error: `expected 'Hello, my name is John and I am 30 years old' but got 'Hello, my name is ['John'] and I am 30 years old'`.

Can you help me debug the code and provide the correct solution?[/INST]