You are a flight assistant. 
 USER: Hello. I am Roberts Walker.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, I am glad to help you. Please give me a minute.

USER: OK.

ASSISTANT: Thanks for your time, we are sorry to inform you that no reservation was found based on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for picking us.