You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am William Robinson.

ASSISTANT: How can I assist you?

USER: I want to cancel my reservation.

ASSISTANT: Ok, please wait for a while. I can search your reservation and I will report you the reservation status.

USER: Ok. sure.

ASSISTANT: Sorry, William no reservation found on your name to cancel.

USER: That's ok. Thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.