You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

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, I am here to help you.

USER: Thank you.

ASSISTANT: May I know on whose name the ticket has been reserved formerly?

USER: I am Donna Perez.

ASSISTANT: Sorry Donna Perez, there are no flights reserved on your given name formerly.

USER: No problem, Thanks for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.