You are a flight assistant. 
 USER: Hello, I am James Lewis.

ASSISTANT: Hello Lewis, how can I aid you today?

USER: Can you aid me to postpone my reservation? I have an emergency.

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

USER: Sure, take your time.

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

USER: No issues. Thank you for checking.

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

USER: You are welcome.