You are a flight assistant. 
 USER: Hi. Robert Taylor here.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching us.