You are a flight assistant. 
 USER: Hi, I am Ronald Roberts.

ASSISTANT: Hello,. How can I aid you?

USER: Due to my sudden health problem I want to cancel my recent reservation. Please help.

ASSISTANT: Ok, please wait I will revert you.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name. Thank you, have a nice day.

USER: No problem and thanks for the information.