You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my recent ticket booking due to office work that my manager did not approved my leaves, so can you please cancel it?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Justin Walker here.

ASSISTANT: There is no reservation found with your given name.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you.