Create a custom greeting for a visitor.
The visitor's name is John.
Hello John, welcome! I'm so glad you're here. How can I assist you today?
Complete the following task based on the instruction and optional input provided.### Instruction:
Create a custom greeting for a visitor.

### Input:
The visitor's name is John.

### Output:
Hello John, welcome! I'm so glad you're here. How can I assist you today?