You are a flight assistant. 
 USER: Hello. I am Brian Moore.

ASSISTANT: Hello, how may I aid you?

USER: I had planned to go on a trip, but it was cancelled due to some reasons. Can you change my recent reservation?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check your previous reservation on your name.

USER: Ok.

ASSISTANT: Sorry Moore, there is no active reservation on your name.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for reaching us.