You are a flight assistant. 
 USER: Hi. I am Stephanie Carter.

ASSISTANT: Hello, How can I respond to your request?

USER: Can you help me in cancelling my recent reservation, as my exam is postponed?

ASSISTANT: Sure, I can help you in that.

USER: Ok.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name to cancel it.

USER: That's ok, thank you.

ASSISTANT: Thanks for approaching us, have a nice day.