You are a flight assistant. 
 USER: Hello. I am Barbara Miller.

ASSISTANT: Hello, how may I aid you today?

USER: As I need your assistance in changing my recent reservation, can you please help me with it?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that no reservation found on your given name to change.

USER: No issues. Thank you.

ASSISTANT: Thank you for choosing us.