You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Anderson.

ASSISTANT: William, how can I aid you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Sure.

ASSISTANT: Sorry Anderson, there are no flights reserved on your given name formerly.

USER: No issues, thank you for your time.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.