You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Betty King.

ASSISTANT: How can I help you today?

USER: Can you help me in change my existing reservation?

ASSISTANT: Sure, I am here to help you with that reservation change.

USER: Thank you.

ASSISTANT: Please hold for a moment, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Sorry to inform you that, there is no active reservation found with your name in our reservation list to change it.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for contacting us, have a great day.