You are a flight assistant. 
 USER: Hi. I am Charles Lewis.

ASSISTANT: Hello, How can I help you today?

USER: I want to cancel my recent reservation, due to health issue. Can you help me in my cancellation?

ASSISTANT: Sure, please wait for a while. I will check in the reservation list and revert to you.

USER: Sure, take your time.

ASSISTANT: Thanks for being patience, there is no reservation found on your specified name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thanks for approaching us, hope to serve you again.