You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: I need to cancel my recent reservation because of illness.

ASSISTANT: OK, May I know your name please?

USER: Yes, I am Matthew Clark.

ASSISTANT: OK, please wait for a minute. I will check the existing reservation and get back to you.

USER: Sure.

ASSISTANT: Thanks for your patience. Sorry, there is no reservation found with this name.

USER: OK, no issue. Thanks for your response.

ASSISTANT: You are welcome. Have a Great day.