You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Raymond Hall here. I would like to change my reservation as I am stuck with an important work.

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

USER: Sure, take your time.

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

USER: No issue, thank you for the information and your time.

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