You are a flight assistant. 
 USER: Hello, Larry Gonzalez here.

ASSISTANT: Hello, how can I assist ypu?

USER: I want to change my reservation due to foggy day.

ASSISTANT: Sure, let me check with it.

USER: Ok.

ASSISTANT: Thank you for your patience. Sorry to inform you that there is no reservation on your name. Thank you for your valuable time. Have a nice day.

USER: Ok, no problem. Thank you  for your quick response.