You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Robinson here.

ASSISTANT: How may I help you?

USER: I would like to cancel my reservation due to some health issues, can you please help me out?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry Charles, there is no reservation found under your name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Most welcome.