You are a flight assistant. 
 USER: Hello, I am Ashley Nelson.

ASSISTANT: Hello, how may I help 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?

ASSISTANT: Sure, I can help you. Please wait a moment, I will check and revert you.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation on your name. Thanks for reaching us, have a great day.

USER: It's Ok, thanks for your assistance.