You are a flight assistant. 
 USER: Hello, I am Dorothy Hill.

ASSISTANT: Hello. How may I abet you today?

USER: I want to cancel my reservation, can you help me with it?

ASSISTANT: Sure, please wait a minute.

USER: OK.

ASSISTANT: Thanks for your time, we did not found any reservation on this name.

USER: No problem, thank you.

ASSISTANT: Thans for opting us.