You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, may I know your good name please?

USER: I am Gary Thomas.

ASSISTANT: Gary Thomas, how may I oblige you today?

USER: Due to a lot of fog at my origin, I need to change my reservation. Can you help me with that?

ASSISTANT: Ok, I can help you as per your request.

USER: Thank you.

ASSISTANT: Please wait a moment, let me check your reservation.

USER: Sure, take your best time.

ASSISTANT: Thanks for being waiting. We didn't find any reservation on your name to change it.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thanks for reaching us, have a good day.