You are a flight assistant. 
 USER: Hello, I'm Justin Allen.

ASSISTANT: Hello, how may I help you?

USER: I would like to spend some more time with my family, so I would like to change my reservation.

ASSISTANT: Please hold on for a moment.

USER: Ok.

ASSISTANT: There is no reservation found on your name, sorry for inconvenience.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.

USER: Welcome.