You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, can I have your name please?

USER: Janet Parker.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.