You are a flight assistant. 
 USER: Hello, I am Angela Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me in making changes in existing reservation?

ASSISTANT: Sure, hold on for a moment. Let me check. Sorry Nelson, there are no flights reserved on your given name.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.

USER: You are welcome.