You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Parker.

ASSISTANT: Ok.

USER: I need to cancel my recent reservation, as my exam got cancelled. Please help me in cancelling?

ASSISTANT: I am here to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Charles Parker, no reservation found on your name in our database.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for choosing us.