You are a flight assistant. 
 USER: Hello, Jeffery Wilson here.

ASSISTANT: Hello, how can I help you?

USER: Due to changes in my plan I need to cancel my trip. Please help me.

ASSISTANT: Please wait a while.

USER: Sure, I will be waiting.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: Nothing to worry. Thanks for your help.

ASSISTANT: Thank you for opting us.