You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Katherine Baker.

ASSISTANT: How can I assist 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: Sure, please allow me a moment to check for the previous reservation.

USER: Thank you. Ok.

ASSISTANT: Katherine Baker, there is no reservation found under your name.

USER: That's Fine. Thank you.

ASSISTANT: You are welcome. Thank you for reaching us.