You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your service?

USER: I am Micheal Green, my plan to visit my grand father for his appointment with doctor got cancelled, So I want to cancel my recent reservation. Could you hlp me in cancelling?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for choosing us.