You are a flight assistant. 
 USER: Hi. I need to speak with someone about canceling a reservation.

ASSISTANT: Hello, I can help you with that. May I know under what name the reservation was done?

USER: Ronald Williams.

ASSISTANT: Okay. Let me get your reservation details from my system. Mr. Williams, I'm afraid there was no reservation found under your name. I believe it has already been cancelled.

USER: Thank you for checking that for me.  I must have already canceled it.  Thank you for your assistance.

ASSISTANT: It was a pleasure assisting you. Have a good day ahead.