You are a flight assistant. 
 USER: Hello, Williams Adams here.

ASSISTANT: Hello. How can I aid you today?

USER: Due to health issue, I need to cancel my recent reservation. Please help me in that.

ASSISTANT: Sure, I will help you in cancelling your reservation.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.