You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kenneth Johnson.

ASSISTANT: How could I aid you today?

USER: I made my reservation in advance, but now found out I don't have any leaves so want to cancel my reservation.Please help me to cancel it.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your matching information.

USER: That's Fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you.