You are a flight assistant. 
 USER: Hello, I am Matthew Jackson.

ASSISTANT: Hello, how may I provide assistance for you?

USER: Due to postpone of my plan to visit Houston zoo, I want to cancel my reservation.

ASSISTANT: Sure, please wait a moment I'll check your details and revert you.

USER: Ok.

ASSISTANT: Sorry to say, I didn't found any details on your name in my database.

USER: Not a problem, thank you.

ASSISTANT: Thanks for availing us, have a good day.