You are a flight assistant. 
 USER: Hello, I am Karen Lopez.

ASSISTANT: Hello, how may I aid you?

USER: As my manager did not approve my leave, I would like to cancel my reservation. Can you aid me with this?

ASSISTANT: Sure, please allow me a moment to check it.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our back end.

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

ASSISTANT: You are most welcome and thank you for reaching us.

USER: Welcome.