You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am John Hernandez. Actually my Hockey competition is postponed, so that I want to change my recent reservation. Can you help me?

ASSISTANT: Sure, I am here to assist you, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry John, I could not find any reservation with your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: My pleasure.