You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

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

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your reservation status.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, I am Donald Scott.

ASSISTANT: Scott, I did not find any active reservation with your name in my database.

USER: That's ok. Thank you for your information.

ASSISTANT: It's my pleasure.