You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Justin Allen.

ASSISTANT: Ok, please hold on a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name.

USER: No problem, thanks for your prompt response.

ASSISTANT: Thank you for reaching us.