You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: Nicole Jackson.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No problem, thanks for your information.

ASSISTANT: Thanks for contacting us.