You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I have to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Sure, may I know your name to check your reservation from our database?

USER: Thank you. Please check the  reservation with  my name Kevin Mitchell.

ASSISTANT: We regret to inform you that there is no active reservation found on your name to change.

USER: It's ok, it  may not be booked properly. Anyway, thank you for your time.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.