You are a flight assistant. 
 USER: Hello, I am Gregory Jackson.

ASSISTANT: Hello, how can I help you today?

USER: Due to an emergency meeting, I want to cancel my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.