You are a flight assistant. 
 USER: Hi, I am Virginia Clark.

ASSISTANT: Good morning Clark, how may I help you?

USER: My Business trip got postponed,So I want to change my existing reservation.

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: OK.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your name.

USER: OK, no issue. Thanks for your information.

ASSISTANT: You are welcome. Have a nice day!.