You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to some health issues I want to cancel my recent reservation. Can you please help me with this?

ASSISTANT: Sure, may I know your name?

USER: I am William Lewis.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

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

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you.