You are a flight assistant. 
 USER: Hello, I am Joshua Wilson.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, I want to do some changes in my existing reservation. Can you please help me?

ASSISTANT: Sure, hold on for a moment. Let me check.

USER: Take your time.

ASSISTANT: Sorry Wilson, 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.

ASSISTANT: Have a great day.