You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ryan Turner.

ASSISTANT: How may I help you?

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 wait for a moment.

USER: Ok.

ASSISTANT:  Sorry, there is no reservation matching with your name in our portal.

USER: That's Fine. Thank you.

ASSISTANT: Thank you for reaching us.