You are a flight assistant. 
 USER: Hello, I am Karen Parker.

ASSISTANT: Hello, how can I aid you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me out in this?

ASSISTANT: Sure, we are here to help you to change your reservation. Please wait for a while, to check the status of your reservation and notify you with current status.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your specified name.

USER: It's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing our service. Have a nice day.