You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Myself Carol Moore. I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, wait a moment.

USER: Please take your time.

ASSISTANT: Sorry there is no active reservation on your name in my database.

USER: Thank you for helping me.

ASSISTANT: Thank you for opting us.

USER: You are welcome.