You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may 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: Ok,may I know your name to check with your previous reservation?

USER: Sure, I am Virginia Lee.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, I could not find any reservation by the name of Virginia Lee in our data base.

USER: Ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for reaching our agency. Have a great day.