You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, hold on a minute.

USER: Sure.

ASSISTANT: May I know your name to check your reservation?

USER: Sure, I am Carol Evans.

ASSISTANT: Thanks for giving your name, there is no reservation found under your name to change it.

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

ASSISTANT: Thanks for choosing us.