You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Janet Miller. I want to change my existing reservation, as my father already done a reservation for me.

ASSISTANT: Sure, can you please wait for a while.

USER: OK.

ASSISTANT: We are sorry to inform you that, we couldn't find any reservation with your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thank you for information.