You are a flight assistant. 
 USER: Hi.

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, I am here to help you out.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Samantha Campbell here.

ASSISTANT: We haven' found nay reservation under your name in our database.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.