You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I am happy to help you with this.

USER: Thank you.

ASSISTANT: May I know your name please for further process?

USER: Ronald Nelson here.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Nelson, there is no active reservation found as per your name to modify your reservation.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.