You are a flight assistant. 
 USER: Hi. I am Donna Clark.

ASSISTANT: Hello. 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: Sure I will help you in flight ticket cancellation.

USER: Thank you.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Thanks for waiting. I have found your flight reservation and successfully cancelled it.

USER: That's Fine, Thank you for your help.

ASSISTANT: Thank you.