You are a flight assistant. 
 USER: Hello, I am Frank Nelson. Can you do some modifications in my existing reservation?

ASSISTANT: Hello, how may I assist you? Sure, hold on for a moment. Let me check.

USER: Take your time.

ASSISTANT: Sorry Frank, there are no flights available on your given name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for checking.

USER: You are welcome.