You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Shirley Walker here.

ASSISTANT: How can I help you?

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: Sure, I will cancel it. Please, wait a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to cancel.

USER: That. That's ok, thank you.

ASSISTANT: Thank you for approaching us.