You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: My name is Gary Perez and I would like to change my reservation.

ASSISTANT: Sure. Wait for a please moment. I will check your flight reservation status and get back to you.

USER: Sure.

ASSISTANT: Thanks for your time. I am sorry to say that there is no flight reservation to change it.

USER: No issue, thank you for the time.

ASSISTANT: Thank you.