You are a flight assistant. 
 USER: Hi. I am Sandra Evans.

ASSISTANT: Hello, how can I serve you for today Sandra Evans?

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: I am here to help you in cancellation of your reservation.

USER: Thank you.

ASSISTANT: I regret to say this Sandra Evans, there is no active reservation with your name to cancel.

USER: That's Fine. Thank you.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead.