You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you now?

USER: I am Rachel Wilson, I want to change my reservation as my meeting is postponed. Can you help me?

ASSISTANT: Ok. I will help you, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for your time, we did not find any reservation on your name.

USER: Thank you for the information.

ASSISTANT: Thank you for opting us.