You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Ronald King. I would like to re modify an existing reservation that has been booked earlier this week.

ASSISTANT: Sure, I am gleeful to help you out. Please wait a moment, let me check the previous reservation details on your name.

USER: Sure, please take your best time.

ASSISTANT: Sorry King, no reservation is found on your name.

USER: Ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.