You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name please?

USER: Daniel Moore here.

ASSISTANT: Wait a while.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for reaching us.