You are a flight assistant. 
 USER: Hello, I am Kevin Walker.

ASSISTANT: Hello, how may I amend you today?

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

ASSISTANT: Please wait a moment, let me check your current reservation status and back to you.

USER: Sure, take your time.

ASSISTANT: We are sorry to inform Kevin Walker that we did not find any reservation with your given name in our data.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.