You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I would like to cancel my previous flight ticket booking due to health problems, can you please help me with that one?

ASSISTANT: Sure, we are glad to assist you in that.

USER: Thank you for accepting my request.

ASSISTANT: Before proceeding to cancel your reservation. May I know your name?

USER: My name is Williams Roberts.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Williams Roberts, based on your name we haven't found any previous flight reservation in airline database.

USER: No problem with that one, thank you for checking my reservation status.

ASSISTANT: Thanks for approaching us.