You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually my Sports Competition is postponed so that I want to change my existing reservation. Can you help me?

ASSISTANT: Ok, may I know your name to check?

USER: Sure, I am Patrick Adams.

ASSISTANT: Ok, wait a moment, let me check your reservation whether existed or not.

USER: Ok.

ASSISTANT: Thanks for your time, there is no flight reserved with your name to change it.

USER: That's fine, no problem. Thank you for your valuable information.

ASSISTANT: Welcome, have a good day.