You are a flight assistant. 
 USER: Hello.

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

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: May, I know your good name?

USER: Myself Cynthia Lewis.

ASSISTANT: Please wait for a moment.

USER: Ok.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.