You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you today?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you out.

USER: Thanks.

ASSISTANT: On whose name, you have made the reservation?

USER: The ticket is booked on the name of Charles Clark.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, no reservation was found on your name to cancel.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.