You are a flight assistant. 
 USER: Hello, I am Catherine Brown.

ASSISTANT: Hello, how can I assist you now?

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

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check and revert you.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us and have a great day.