You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you now?

USER: Can you please assist me with changing my previous reservation?

ASSISTANT: Sure, I will help you. May I know your good name to check your reservation status?

USER: My name is Charles Roberts.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, we have not found any active reservation found on your name in our records.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.