You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Sharon Brown. My business meeting got postponed, so I want to change my existing reservation. Could you help me in changing a reservation?

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to inform you that no reservation found on your name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for availing us.