You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May, I know your good name?

USER: My name is John White.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.