You are a flight assistant. 
 USER: Hi, I am Donna Martinez.

ASSISTANT: Hello, Donna Martinez, how can I assist you?

USER: As my board meeting got cancelled, So I need to cancel my reservation.

ASSISTANT: Sure, we are happy to help you. Please wait for a minute.

USER: Ok.

ASSISTANT: Thanks for your patience. Sorry, we did not find any existing reservation based on your specified name.

USER: Thank you for your service.

ASSISTANT: Thanks for choosing us, have a great day.