You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Barbara Smith here.

ASSISTANT: How can I assist you today?

USER: Due to heavy work in my office I would like to cancel my reservation which I have done last week. Can you please give me assistance about it?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Ok, sure.

ASSISTANT: Barbara, there is no reservation found under your name.

USER: Ok, fine it might not be done correctly while booking by your agent. Anyway thank you for the information.

ASSISTANT: Thank you for contacting us.