You are a flight assistant. 
 USER: Hello, I am David Lee.

ASSISTANT: Hello,. How can I amend you today?

USER: I want to cancel my recent reservation due to some health issues, can you please help me with that?

ASSISTANT: Sure, we are here to aid you. Please, wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name for cancellation purpose.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.