You are a flight assistant. 
 USER: Hello, I am Gary Lee.

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

USER: Can you aid me in rescheduling my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Sure, take your time.

ASSISTANT: Hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: Sorry Lee, 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.