You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation, as I am not interested to travel now. Can you please help me with this?

ASSISTANT: Ok, may I know your name please for further process?

USER: Sure, I am Gregory Perez.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Perez, there is no reservation found as per your name to change your reservation.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome.