You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can support you today?

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

ASSISTANT: Surely, I will help you out. Please wait for a few minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name to change.

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

ASSISTANT: Thank you for reaching us.