You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for the day?

USER: I want to change my reservation due to some personal work at home, so please help me.

ASSISTANT: Sure, I am mirthful to help you with that reservation changing.

USER: Thank you.

ASSISTANT: Please hold for a while, let me check your previous reservation status. May I know your name please?

USER: Sure, I am Jonathan Hill from Charlotte.

ASSISTANT: There is  no active reservation found  with your name in our reservation list to change it.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us, have a great day.