You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please assist me in cancelling my previous flight reservation as I modified my journey dates.

ASSISTANT: Sure, please share me your good name.

USER: Myself Sandra White.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thanks for your service.