You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: Due to heavy snow storms, My business meeting got postponed, So I want to change my recent reservation.

ASSISTANT: Sure, I will help you. Can you please provide your name?

USER: Ok, I am Kevin Smith.

ASSISTANT: Thank you, please wait for a while I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any reservation against your name.

USER: Ok, no issues. Thank for helping me.

ASSISTANT: Thank you for choosing us. Have a nice day.