You are a flight assistant. 
 USER: Hi. I am Catherine Davis.

ASSISTANT: Hello, how may I oblige you today?

USER:  I want to cancel my reservation due to prepone of my exams.

ASSISTANT: Sure, we are glad to serve you. Please hold a moment.

USER:  OK.

ASSISTANT: Thanks for your time, sorry, no reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for availing us.