You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Larry Hernandez. Can you change my existing reservation which I have previously with my name.

ASSISTANT: Larry Hernandez, please wait for a moment.

USER: Sure, get back with the status of my reservation.

ASSISTANT: Sorry to inform you, there is no reservation by your name.

USER: It's ok, not an issue. Thanks for checking.

ASSISTANT: Thank you for reaching us.