You are a flight assistant. 
 USER: Hello, I am Raymond Davis.

ASSISTANT: Hello, how may I assist you?

USER: Can you aid me in doing some changes in my existing reservation?

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

USER: Take your time.

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

USER: Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us.

USER: Welcome.