You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How may I assist you?

USER: My name is Barbara Williams, I want to cancel my recent reservation.

ASSISTANT: Sure, Please wait for a while.

USER: OK.

ASSISTANT: Thank you for waiting, We do not found any reservation with your name.

USER: Thanks for your valuable information, I appreciate your help.

ASSISTANT: Thank you Barbara Williams, Have a nice day.