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

ASSISTANT: Hello, how may I support you today?

USER: While I am in tension, I made a reservation earlier on the wrong date. So I want to change my reservation to make it correct.

ASSISTANT: Sure. Please wait for some time.

USER: OK.

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

USER: Ok, not a problem at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for contacting us, hope to serve you again.