You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My planned trip has been changed unexpectedly, so I decided to cancel my recent reservation, will you help me?

ASSISTANT: Sure, I will help you with cancelling your reservation. May I know good name for checking reservation status?

USER: My past ticket is reserved with name Kevin Parker. So please check with this name.

ASSISTANT: Sure, please wait for checking reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry Kevin, no reservation has found under your name to cancel.

USER: It's ok, thank you for checking.

ASSISTANT: Most welcome. Thank you for choosing us.