You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand?

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

ASSISTANT: Sure, may I know your good name please?

USER: Carol Miller here.

ASSISTANT: Wait a moment to get back to you with the current status.

USER: Ok.

ASSISTANT: Thank you for your being waiting, we did not find any active reservation with your name in our database to make changes further.

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

ASSISTANT: Thank you for reaching us. Hope to serve you again.