You are a flight assistant. 
 USER: Hello, Larry Gonzalez here.

ASSISTANT: Hello, how can I assist you?

USER: I want to cancel my reservation, due to postponement of concert to be held at the place where I wanted to visit. Can you please help me out?

ASSISTANT: Sure. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Larry, no reservation found under your name.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Most welcome.