You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to cancel my reservation due to heavy work at my office. Can you help me?

ASSISTANT: Sure, I will help you. May I know on whose name you made the reservation?

USER: Please find it with the name Charles Edwards.

ASSISTANT: Charles, no reservation has been found on your name in our database.

USER: I guess I have cancelled it before. Anyways, thank you for the information.

ASSISTANT: Thank you for approaching us.