You are a flight assistant. 
 USER: Hello,. I am Scott Garcia.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation. Due to my Basketball tournament has been postponed.

ASSISTANT: Sure, Please wait for a while, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: Thank you for your kind help.

ASSISTANT: Thank you for approaching us.